content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
calculating flux through a surface
My question is:
Compute the flux of the vector field, $\vec{F}$ , through the surface, S.
$\vec{F} = 7\vec{r}$ and S is the part of the surface $z = x^2 + y^2$ above the disk $x^2 + y^2 \leq 4$ oriented downward.
My answer so far is
$\int\limits_R (7x\vec{i} + 7... | 5 | [
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0.062255859375,
-0.05078125,
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-0.0654296875,
0.065917968... | 34,300 | 34300 | |
Parametric question...confused on trig =/
December 31st 2008, 07:23 AM #1
Parametric question...confused on trig =/
Question:
A curve has parametric equations
x = 3 cos2 t, y = sin 2t, 0 ≤ t < π.
(i) Show that
= $\frac{dy}{dx} = -\frac{2}{3}cot 2t$
(ii) Find the coordinates of the points where... | 5 | [
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-0.035400390625,
-0.006... | 34,301 | 34301 | |
Numerical analysis problem
February 21st 2009, 08:28 AM
tedeman
Numerical analysis problem
Let A be a given positive constant and g(x)=2x-Ax^2
a. Show that if fixed-point iteration converges to a nonzero limit, then the
limit is p=1/A, so the reciprocal of a number can be found using only
multiplica... | 4 | [
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-0.0317382... | 34,302 | 34302 | |
Calculus Please help!
Posted by ALI on Friday, February 28, 2014 at 8:20pm.
The linearization at a=0 to sqrt(1+2x) is A+Bx where A is____ and where B is _____?
A=?
B=?
Ty
• Calculus Please help! - Steve, Saturday, March 1, 2014 at 6:28am
the linearization is just finding a straight line that is close to the... | 4 | [
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Characteristic Function
March 15th 2009, 01:48 PM #1
Member
Joined
Oct 2008
Posts
156
Characteristic Function
Define $f$ as follows: $f(x) = \begin{cases} 0 \ \ \ \ \text{if} \ x \ \text{is rational} \\ 1 \ \ \ \ \text{if} \ x \ \text{is irrational} \end{cases}$
Prove $f$ is not Riemann integrable u... | 5 | [
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-0.01477050781... | 34,304 | 34304 | |
Sequences - At A Glance
Topics
Introduction to Sequences - At A Glance:
Let's imagine, instead of numbers, we have a sequence of animals. The sequence begins with three animals: green, tap dancing elephant, purple, singing cockatoo, and orange, quarterback tiger. We
could refer to the first term as green, tap dancing... | 4 | [
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0.0625,
-0.0020904541015625,
-0.0223... | 34,305 | 34305 | |
Integral
Quote:
I hate calculators, they ruin the mathematical abilities of students. Look at China they still use abacus and they got one of the best math education programs. Russia also, and I am sure they do
not have those fancy calculators like the TI (in fact I do not own one) and they have also one o... | 5 | [
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0.0441894531... | 34,306 | 34306 | |
Probability query
January 10th 2011, 01:34 AM #1
Newbie
Joined
Jan 2011
Posts
2
Probability query
Last night my girlfriend posed a rhetorical question that I mistakenly answered leading to a several hour 'debate'.
Essentially she said "I was at a concert with my mum, and my brother's girlfriend, who... | 4 | [
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... | 34,307 | 34307 | |
The probability of two random points on a plane being closer than a certain distance?
October 13th 2011, 01:58 AM
ingenious
The probability of two random points on a plane being closer than a certain distance?
Hi,
I've been struggling with the following problem for some time now, and it seems that I need so... | 5 | [
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Combinatorial Proof
June 2nd 2010, 08:51 PM #1
Combinatorial Proof
Attached is the section on Combinatorial Proofs from my text. I am a little confused. I understand the proof of the special case, then it goes on to say "It is no harder to prove in general."
I would prove this identity in the following manne... | 4 | [
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ad
Cassandra is repaying an installment loan of $3500 with 20 equal monthly payments of $196 each
Cassandra is repaying an installment loan of $3500 with 20 equal monthly payments of $196 each. What is the annual percentage rate of the loan?
If there are N payments of $M to pay off a principal of $P, let
q = log[2... | 5 | [
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establish the following:
March 26th 2010, 09:33 AM #1
Junior Member
Joined
Dec 2008
Posts
68
a)cos^2 alfa - sin^2 alfa = 1 +2sin^2 alfa
b)cos^2 alfa - sin^2 alfa =2cos^2 alfa - 1
c)1+tan^2 alfa = 1/sin^2 alfa
e)1+tan^2 alfa /tan^2 alfa = 1/sin^2 alfa
help!
Hello lebanon
You have o... | 4 | [
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Are there functions satisfying the following integral condition?
up vote 5 down vote favorite
1
Can we find two functions $f$ and $g$ that are reasonably defined nontrivial(not everywhere zero, $f\neq g$, not linear polynomials) functions such that the following condition is satisfied?
$$ f( \left(\int_{0}^{t} g(x)... | 5 | [
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Solving a DE...need help!
February 10th 2010, 12:27 AM #1
Junior Member
Joined
Oct 2008
Posts
43
Solving a DE...need help!
Hey.
My problem is $y(t)' + (1/y(t)+1) = 0$, where $y(0) =2$.
I am having a hard time getting y(t).
At first glance, this looks like a homogenous ODE...but using the f... | 5 | [
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... | 34,313 | 34313 | |
Homework Help
Posted by Anonymous on Tuesday, April 26, 2011 at 2:54pm.
how do i solve this completing the square problem: 3x^2+12x+10=0
• trig - MathMate, Tuesday, April 26, 2011 at 3:31pm
3x^2+12x+10=0
3(x^2+4x+10/3)=0
(x+2)²-4+10/3=0
(x+2)²-(√(2/3))²=0
(x+2+√(2/3))(x+2-√(2/3))=0
therefor... | 4 | [
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Homework Help
Posted by Anonymous on Wednesday, September 22, 2010 at 11:06pm.
can some one solve this
Ex 1:
-2x+7>22
-2x+7-7>22-7
-2x>15
-2x/(-2)<15/(-2) Switching the order of the inequality here is essential to keep the solutions true for the inequality since I divided by a negative #.
x<-7.5
Check:
Try -8.... | 4 | [
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Two question's dealing with average or effective markup!
November 30th 2010, 02:30 PM #1
Newbie
Joined
Nov 2010
Posts
1
Two question's dealing with average or effective markup!
Hey I would really appreciate if some one could show me the calculations for these questions as my text is lacking examples. I h... | 4 | [
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Center, Radius, and Standard Form
April 13th 2007, 10:10 PM #1
Newbie
Joined
Apr 2007
Posts
6
Center, Radius, and Standard Form
Hi all, I have a question I'm unsure of how to do. I might need a good explanation... I'm a little slow with math.
If (10,4) and (4,10) are the endpoints of a diameter of a... | 4 | [
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A lot of algebra problems, a little time to do them!
October 19th 2006, 06:42 AM
Ana-Maria
A lot of algebra problems, a little time to do them!
Hi everybody!
I have few problems that needs to be solve by to tomorrow!!! Some of the problems are quite easy, but I just don't seem to get the right answers.
... | 4 | [
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What arithmetic should I memorize?
Author Message
TAGS:
tkaelle Re: What arithmetic should I memorize? [#permalink] 16 Mar 2012, 16:17
Intern I know this post is q... | 4 | [
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Homework Help
Posted by Lucy on Tuesday, September 30, 2008 at 3:45pm.
I am having difficulty with two problems:
1) Evaluate (1+i)^12 by using DeMoivre's Theorem. Express the result in rectangular form.
So far I have: r=sqrt(1)^2+(1)^2 which simplified is sqrt2. Don't know how to proceed.
2) Write the polar equatio... | 5 | [
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Dice Probability (FUN QUESTION!)
December 19th 2012, 06:35 PM #1
Newbie
Joined
Dec 2012
From
United States
Posts
6
Dice Probability (FUN QUESTION!)
Person x rolls a die three times. What is the probability that her second and third rolls are both larger than her first roll?
(ex 5:6:6) (not ex:5:5... | 4 | [
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-0.00448608398... | 34,321 | 34321 | |
Finding a derivative using first principles
June 10th 2010, 07:55 PM #1
Senior Member
Joined
Apr 2010
Posts
487
Finding a derivative using first principles
I'm working on this question:
if f(x) = x^3, then the derivative is 3x^2
I have to prove this using the definition of the derivative. I got... | 4 | [
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... | 34,322 | 34322 | |
Physics, help please!
Posted by ALan on Tuesday, March 2, 2010 at 8:23pm.
A hypothetical spherical planet consists entirely of iron (p=7860 kg/m^3). Calclate the period of a satellite that orbits just above its surface.
I started out with the pressure formula P=M/V, but i kept subbing in other formulas, but i get stu... | 5 | [
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... | 34,323 | 34323 | |
Graph of the Function
November 16th 2008, 09:47 PM #1
MHF Contributor
Joined
Jul 2008
From
NYC
Posts
1,489
Graph of the Function
If the roots of
ax^2 + bx + c = 0 are real, rational, and equal, what is true about the graph of the function
y = ax^2 + bx + c?
(1) It intersects the x-axis ... | 4 | [
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Ordinary Differential Equations Integration
13 Ordinary Differential Equations Integration
13.1 Overview
The ode package provides classes to solve Ordinary Differential Equations problems.
This package solves Initial Value Problems of the form y'=f(t,y) with t[0] and y(t[0])=y[0] known. The provided integrators com... | 5 | [
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0.... | 34,325 | 34325 | |
Functional means
Functional means are a way of inducing a mean M[f] from a differentiable function f.
If f(x) = x^2, M[f](x, y) = (x + y)/2 is the arithmetic mean.
If f(x) = 1/x, M[f](x, y) = √(xy) is the geometric mean.
Seems like this should be useful for something.
Related post: Means and inequalities
12 thoug... | 4 | [
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0.07519531... | 34,326 | 34326 | |
Proof Using Modular Arithmetic
October 18th 2009, 02:29 PM
ilikecandy
Proof Using Modular Arithmetic
show that if an integer n has at least two distinct odd prime divisors then there exists k<φ(n) such that
a^k ≡ 1(mod n)
for every a relatively prime to n.
What I have so far: The expression a^k ≡... | 5 | [
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0.055908203125,
-0.0242919921875,
0.10791015625,
0.0308837890625,
0.01336669921875,
0.0026702880859375,
0.04248046875,
0.0439453125,
0.01611328125,
0.0140380859375,
0.0096435546875,
0.0439453125,
-0.0625,
-0.00537109375,
0.0... | 34,327 | 34327 | |
Write an equation to solve these problems
June 1st 2009, 07:17 AM #1
Newbie
Joined
May 2009
Posts
2
Write an equation to solve these problems
Hi
I have exams in a few weeks and am stuck on some basic questions which the teacher hasn't taught due to their 3 month absence. We didn't finish the syllabu... | 4 | [
-0.047119140625,
0.05322265625,
0.052490234375,
0.020263671875,
-0.0771484375,
-0.032958984375,
0.04541015625,
0.026123046875,
-0.053955078125,
0.07763671875,
0.0159912109375,
-0.056396484375,
0.052978515625,
0.0223388671875,
0.03271484375,
0.05810546875,
-0.0908203125,
-0.0390625,... | 34,328 | 34328 | |
factorial sum in java
1.
Join Date
Mar 2011
Posts
27
Rep Power
0
I am trying to make a program that finds the sum of:
∑ (2n+1)!
In this program the user inputs the upper limit of the program and the lower limit is always 0.
So if the user input t... | 5 | [
-0.00372314453125,
-0.01495361328125,
-0.0174560546875,
-0.02392578125,
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0.02490234375,
0.0810546875,
-0.06689453125,
0.002716064453125,
-0.0791015625,
-0.05322265625,
0.0576171875,
-0.06982421875,
-0.05810546875,
-0.052490234375,
-0.0252685546875,
0.... | 34,329 | 34329 | |
Homework Help
Posted by Lucy on Saturday, August 30, 2008 at 10:12pm.
How do you work this problem. I cannot find an example in the book to illustrate how to work it.
Find the value of tan(a-b) if cos a=-3/5, sin b=5/13, 90<a<180, and 90<b<180
Thanks for any help
• Pre-Calculus - Reiny, Saturday, August 30, 2008 ... | 4 | [
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0.0264892578125,
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0.0272216796875,
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0.01220703125,
-0.057373046875,
-0.... | 34,330 | 34330 | |
Sampling Distribution
Posted by Dre on Wednesday, February 27, 2013 at 10:54pm.
Sampling Distribution
Complete solutions and illustrations are required.
3.The mean systolic blood pressure of normal adults is 120 millimeters of mercury (mm Hg) and the standard deviation is 5.6. Assume that the variable is normally di... | 4 | [
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0.0849609375,
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0.006317138671875,
-0.0585937... | 34,331 | 34331 | |
Second order differential equation
February 13th 2010, 09:03 PM
gundu24
Second order differential equation
Hi everybody, I have absolutely no idea how to tackle this problem:
Let p(x) be a solution of the differential equation $y\prime\prime + yy\prime = x^{3}$ with initial conditions $y(-1) = 1$ and $y\pri... | 4 | [
-0.1318359375,
-0.056884765625,
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0.020263671875,
0.0166015625,
0.00225830078125,
-0.041015625,
-0.08203125,
... | 34,332 | 34332 | |
Another Expectation through conditioning question
July 27th 2011, 11:39 PM #1
Senior Member
Joined
Oct 2009
Posts
295
Thanks
9
Another Expectation through conditioning question
(1) A gambler wins each game with probability p. In each of the following cases, determine the expected total number of wins... | 5 | [
-0.0233154296875,
-0.0225830078125,
-0.00933837890625,
-0.024169921875,
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0.17578125,
-0.042236328125,
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0.031494140625,
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0.0189208984375,
-0.006317138671875,
0.0003032684326171875,
0.11328125,
-0.0255126953... | 34,333 | 34333 | |
Homework Help
Posted by Anna-Marie on Tuesday, January 29, 2008 at 6:18pm.
if you have two similar polygons and the scale factor is 3:5 and 12 times square root of 3 is one side, what is the cooresponding side
• geometry - Reiny, Tuesday, January 29, 2008 at 6:30pm
let the other side be x
You don't say if... | 4 | [
0.061767578125,
0.0040283203125,
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0.04736328125,
-0.00946044921875,
-0.0361328125,
-0.0434570312... | 34,334 | 34334 | |
Homework Help
Posted by Liz on Sunday, October 7, 2012 at 4:56pm.
grain is being poured through a chute at rate of 8 ft^3/min and forms a conical pile whose radius of the bottom is always 1/2 the height of pile. How fast is circumference increasing when the pile is
10 feet high?
• calculus - Reiny, Sunday, October ... | 5 | [
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... | 34,335 | 34335 | |
vector problem
September 16th 2009, 02:16 AM #1
vector problem
Hey
OABCDEFG is a cuboid
-> -> ->
OA= 3j OC=2k OD=i
M is such that ->
OM= 1/3 ->
OE
N is the midpoint of BF. Find
a) ->
MN
not sure how to start, i drew a cuboid but dont know how to find the 1/3 of OE
... | 4 | [
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... | 34,336 | 34336 | |
For which n is there exactly one abelian group of order n?
February 25th 2010, 04:20 PM #1
Newbie
Joined
Feb 2010
Posts
14
For which n is there exactly one abelian group of order n?
For which $n$ is there exactly one abelian group of order $n$?
I know that the answer is the product of distinct prime... | 5 | [
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0.068359375,
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... | 34,337 | 34337 | |
Homework Help
Posted by ali on Tuesday, July 26, 2011 at 2:16pm.
You want to estimate the grades of st2%atistics students who gets grades of C or better. How many students should you survey to be 95% confident that the sample percentage is off by no more than 2
percentage points.
• statistics - MathGuru, Tuesday, J... | 4 | [
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0.0272216796875,
-0.0121459960937... | 34,338 | 34338 | |
Anais da Academia Brasileira de Ciências
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Print version ISSN 0001-3765
An. Acad. Bras. Ciênc. vol.72 n.2 Rio de Janeiro June 2000
http://dx.doi.org/10.1590/S0001-37652000000200003
Surfaces in ... | 4 | [
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0.039306640625,
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-0.0556640625,
-0.0106811... | 34,339 | 34339 | |
The Nonrelativistic Scattering States of the Deng-Fan Potential
Advances in High Energy Physics
Volume 2013 (2013), Article ID 317605, 5 pages
http://dx.doi.org/10.1155/2013/317605
Research Article
The Nonrelativistic Scattering States of the Deng-Fan Potential
^1Department of Basic Sciences, Shahrood Branch, Islami... | 5 | [
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Mathematical Induction Proof
May 5th 2010, 09:54 AM
RedKMan
Mathematical Induction Proof
I cannot get my head around this at all.
Suppose that v is of type Set of Integers and we know the following:-
1. v is sorted.
2. No two items in v are the same.
3. v.at(1) is 12.
For an integer n, whe... | 4 | [
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0.033935546875,
-0.013916015625... | 34,341 | 34341 | |
Homework Help
Posted by Brit on Tuesday, August 16, 2011 at 8:18pm.
Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region.
2y=3sqrtx
and
y=3
and
2y+2x=5
• CALCULUS:) - Brit, Tuesday, August 16, 2011 at 8:18pm
its not 8
• CAL... | 4 | [
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-0.084960937... | 34,342 | 34342 | |
Binary Numbers
January 6th, 2011, 01:51 PM #1
Junior Member
Join Date
Jan 2011
Posts
1
Thanks
1
Thanked 0 Times in 0 Posts
Need your help! Please.
I did some exercises. It's binary numbers.
But the problem is that i don't know if it's
right. Maybe there are some mistakes and it
wou... | 4 | [
0.0286865234375,
0.1083984375,
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0.0203857421875,... | 34,343 | 34343 | |
Problem of hats
December 19th 2010, 08:56 PM
phillipshwong
Problem of hats
There are N people. All with their own, unique hat. Each throw his hat into a pile, and mix it. The number of ways for n < N to get their hats is ( N-n)!. Why?
December 19th 2010, 09:07 PM
pickslides
To understand these problems I ... | 4 | [
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-0.0... | 34,344 | 34344 | |
Homework Help
Posted by Aly on Sunday, December 1, 2013 at 10:08pm.
a baseball is popped straight up. the ball leaves the bat moving at 37.8 m/s. to what height did the ball rise.
t=7.72 s
the answer is 73 m, but how do you get that answer
• Physics - bobpursley, Sunday, December 1, 2013 at 10:20pm
initial K... | 4 | [
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-0... | 34,345 | 34345 | |
I need HELP on how to set this up!
January 12th 2009, 05:45 PM #1
Newbie
Joined
Jan 2009
Posts
4
I need HELP on how to set this up!
A manufacturer of bolts wants to determine the length of the manufactured bolts. A random sample of 160 bolts shows that the sample mean length is 2.9 inches and that the sa... | 5 | [
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... | 34,346 | 34346 | |
Angle in a circle.
April 22nd 2011, 04:28 PM
fcabanski
Angle in a circle.
http://www.mathhelpforum.com/math-he...%22%3E%3C/a%3Ehttp://i80.photobucket.com/albums/j1...its/CIRCLE.jpg
Segments RU, SV and TW are diameters of the circle.
Measure of angle RSO is 50 degrees.
If Segment TW bisects angle R... | 4 | [
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-0.... | 34,347 | 34347 | |
Journal of the Brazilian Society of Mechanical Sciences
Services on Demand
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Print version ISSN 0100-7386
J. Braz. Soc. Mech. Sci. vol.22 n.1 Rio de Janeiro 2000
http://dx.doi.org/10.1590/S0100-73862000000100006
Effect of Wave Frequency on the Nonlinear Interaction Between... | 4 | [
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-0.0172119140625,
-0.00... | 34,348 | 34348 | |
Homework Help
Posted by Anonymous on Friday, April 20, 2012 at 9:54pm.
Solve system of equations algebraically.
1. 3x-3y=24 and 2x+5y=-37
2. -9x+10y=-2 and 45x-50y=11
3. -9x-3y=-3 and 18x+6y=6
4. -5x-6y=-23 and 8x+7y=29
5. 9x-7y=4 and 5x+3y=-46
• MATH - Reiny, Friday, April 20, 2012 at 11:10pm
I will do t... | 4 | [
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Product of Powers Property
How do you simplify 7^2 × 7^6?
If you recall the way exponents are defined, you know that this means:
(7 × 7) × (7 × 7 × 7 × 7 × 7 × 7)
If we remove the parentheses, we have the product of eight 7s, which can be written more simply as:
7^8
This suggests a shortcut: all we need to do is ... | 4 | [
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0.1572265625,
... | 34,350 | 34350 | |
Cosets
September 22nd 2009, 01:23 PM
Godisgood
Cosets
If every right coset of H in G is a left coset of H in G prove that
aHa^-1 = H for all a elements of G?
September 22nd 2009, 02:23 PM
HallsofIvy
Quote:
For every a in G, and every h in H, ah is in aH. If "every right coset of H in G is a left... | 5 | [
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0.052490234375,
-0.0189208984375,
-0.01... | 34,351 | 34351 | |
What factors influence Citi Bike usage?
In an earlier post I graphed Citi Bike data and daily temperature.
That graph prompted me to take a closer look at the Citi Bike data in order to attempt to answer two questions:
1. Is temperature really having a statistically significant impact on Citi Bike use?
2. What oth... | 4 | [
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... | 34,352 | 34352 | |
Math Help
November 7th 2007, 03:37 AM #1
Trig Limit
Find the value of $\displaystyle\lim_{x\to{0}}\frac{\sqrt{1+tan\;x}-\sqrt{1+sin\;x}}{x^3}$
Is there an alternate way of doing this question without using l'Hosital's Rule
or this: $\displaystyle\lim_{x\to{0}}\frac{\sqrt{1+tan\;x}-\sqrt{1+sin\;x}}{x^3}... | 5 | [
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... | 34,353 | 34353 | |
Electronics for Absolute Beginners, Chapter 3
Welcome to Chapter 3!
In this chapter we will go through:
1. Series Circuits
2. Voltage Divider Rule
3. Applied Voltage
4. Kirchoff's Voltage Law
5. Power in Series Circuit
6. Effects of Open in Series Circuit
7. Effects of Close in Series Circuit
8. Designing a Series Ci... | 4 | [
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-0.1298828125,
0.08935546875,... | 34,354 | 34354 | |
Homework Help
Posted by Keisha on Wednesday, July 13, 2011 at 11:40pm.
1.Write an equation of the line containing the given points and parallel to the given line (3,8); x+5y=3
2. Write an equation of the line containing the given points and parallel to the given line (-3,6); 5x=9y+2
3. Write an equation of the line ... | 4 | [
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0.0198974609375,
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0.0634765625,
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0.06884765625,
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0.08740234375,
0.031005859375,
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0.0223388671875,
-0.08837890625,
-0.07177734... | 34,355 | 34355 | |
Need help on this proof
October 22nd 2009, 10:31 PM #1
Junior Member
Joined
Oct 2009
Posts
37
Need help on this proof
I have to prove the following:
Suppose that functions f and g are continuous at $x=c\in (a,b)$ and f(c) > g(c). Prove there exists $\delta$ > 0 such that for all $x\in (a,b)$ with $|... | 5 | [
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0.0751953125,
0.0140380859375,
0.043212890625,
-0.0... | 34,356 | 34356 | |
Fibonacci number proof
September 14th 2008, 05:35 PM #1
Newbie
Joined
Sep 2008
Posts
1
Fibonacci number proof
The Fibonacci numbers are: 1, 1, 2, 3, 5, 8, 13, 21, 34, .... In general, the Fibonacci numbers are defined by f sub(1) = 1, f sub(2) = 1, and for n>or= 3, f sub(n) = f sub(n-1) + f sub(n-2).
... | 5 | [
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0.0038299560546875,
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0.0062255859375,
-0.061279296875,
0.000013... | 34,357 | 34357 | |
On the Spectrum of Threshold Graphs
ISRN Discrete Mathematics
VolumeΒ 2011Β (2011), Article IDΒ 108509, 21 pages
http://dx.doi.org/10.5402/2011/108509
Research Article
On the Spectrum of Threshold Graphs
Mathematics Department, Faculty of Science, University of Malta, Msida MSD 2080, Malta
Received 29 September 201... | 4 | [
-0.0576171875,
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-0.027... | 34,358 | 34358 | |
Math Help
Prove that if two nonvertical lines have slopes whose product is -1, then the lines are perpendicular. HINT GIVEN: Use the converse of the Pythagorean Theorem.
The converse of the Pythagorean theorem is that if triangle ABC has sides a,b,c with the usual labelling, and a^2+b^2=c^2, then the angle at C is ri... | 4 | [
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0.0150... | 34,359 | 34359 | |
more matrix algebra
January 26th 2009, 03:15 AM #1
Member
Joined
Oct 2008
From
Melbourne
Posts
166
more matrix algebra
Ok, so, given that, $C^{-1} = LD^{-1}L^{-1}$, and $C$ is a real valued non-singular $n$ x $n$ matrix, $D$ is the diagonal matrix of $C$'s $n$ distinct real non-zero eigenvalues, and ... | 4 | [
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-0.07373046875,
0.0595703125,
0.0220947265625,
... | 34,360 | 34360 | |
Exponential functions help
November 21st 2011, 05:30 AM #1
Newbie
Joined
Nov 2011
Posts
1
Exponential functions help
Basically, I don't get exponential equations. Could someone please help me? These are the two I'm having the most trouble with:
2^(1 - 2x) = 3x
(7/9)^x=11^1-x
Re: Exponential fu... | 5 | [
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-0.03759765625,
0.023193359375,
-... | 34,361 | 34361 | |
maximal ideal in R[x,y]
January 14th 2009, 02:35 AM #1
Newbie
Joined
Dec 2008
Posts
16
maximal ideal in R[x,y]
Show that every maximal ideal $m \subset \mathbb{R}[x,y]$ is one of the following:
* $m=<x-a,y-b>$ for some $a,b \in \mathbb{R}$;
* $m=<y-rx-s,x^2+vx+w>$ for some $r,s,v,w \in \mathbb{R}... | 5 | [
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-... | 34,362 | 34362 | |
the encyclopedic entry of contrate
This is the page for mechanical Gears. For other uses see Gear (disambiguation)
For the gear-like device used to drive a roller chain see sprocket
A gear is a component within a transmission device that transmits rotational force to another gear or device. A gear is differen... | 4 | [
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0.0751953125,
0.1074... | 34,363 | 34363 | |
Streaks & Runs
March 10th 2006, 11:57 AM #1
Newbie
Joined
Mar 2006
Posts
2
Streaks & Runs
Say you have the following distribution of streaks of wins & losses of length N. (A streak is defined by exactly N wins or losses in a row, followed by a new streak of the opposite kind.)
(Sorry this table did ... | 5 | [
-0.055908203125,
0.0302734375,
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-0.05322265625,... | 34,364 | 34364 | |
Differential Equations - At A Glance
Topics
Introduction to Differential Equations - At A Glance:
We can use differential equations to talk about things like how quickly a disease spreads, how fast a population grows, and how fast the temperature of cookies rises in an oven. Translating between
English and differenti... | 4 | [
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0.078... | 34,365 | 34365 | |
Brazilian Journal of Physics
Services on Demand
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Share
Print version ISSN 0103-9733
Braz. J. Phys. vol.31 no.2 São Paulo June 2001
http://dx.doi.org/10.1590/S0103-97332001000200016
Noncommutative Supers... | 4 | [
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-0.00... | 34,366 | 34366 | |
number of series possible
October 31st 2013, 12:40 AM
nikhil
number of series possible
Greetings,
struck with the question that how many sequences of consecutive numbers exist such that on adding them we get 500.
thanks
October 31st 2013, 04:03 AM
Plato
Re: number of series possible
Quote:
... | 5 | [
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-0... | 34,367 | 34367 | |
Differentiation under the integral sign
How it is done
Consider
[tex]I(b)=\int_0^1 \frac{x^b-1}{lnx} dx[/tex]
now u can see clearly that after plugging the limits the variable x will vanish the only variable remains is b so the integration will be a function with b
While integrating w.r.t x u consider b as a constan... | 5 | [
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0.1015625,
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-0.048828125,
-0.... | 34,368 | 34368 | |
Please help with derivatives and functions
November 5th 2012, 06:37 AM
ZKR
Please help with derivatives and functions
Hello,
I`m a total noob in math and barely remember anything from high school past one variable equations.
If someone can help me with several issues here, I`d be most appreciated.
I... | 4 | [
0.00946044921875,
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0.... | 34,369 | 34369 | |
need help on quadratic reciprocity
April 8th 2009, 04:03 PM #1
Junior Member
Joined
Feb 2009
Posts
40
need help on quadratic reciprocity
Prove that the quadratic residues of 11 are 1,3,4,5,9, and list all solutions of each of the ten congruences
$x^{2} \cong a(\bmod 11)$ and $x^{2}\cong a(\bmod 11^{2... | 5 | [
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0.05810546875,
-0.016845... | 34,370 | 34370 | |
Homework Help
Posted by Victoria on Wednesday, May 14, 2008 at 1:04am.
What would you do...
(4)^(3/square root 2) ÷ 16^(2*square root 2) ?
• Math - drwls, Wednesday, May 14, 2008 at 1:59am
Recognize that
16^(2*square root 2)= (4^2)^(2sqrt2)
= 4^(4sqrt2)
So your expression can be written
4^(3/... | 4 | [
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0.05102539062... | 34,371 | 34371 | |
Find the exact values
July 9th 2008, 06:24 AM #1
Newbie
Joined
Jun 2008
From
Marion, VA
Posts
18
Find the exact values
For each pair of values of sin(`theta) and cos(`theta), find the exact values of the four remaining trigonometric functions, when this is possible; otherwise find the four remianing ... | 4 | [
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-0.06... | 34,372 | 34372 | |
Binomial Expansion?
January 15th 2009, 01:51 PM
oupib
Binomial Expansion?
Hi, I am having trouble with the following queston:
The constant in the expansions of (Equation 1) and (2) are equal, and k and p both greater than zero. Express k in terms of p.
Equation 1
( kx^2 + 6/x^2 ) ^4
Equation 2... | 4 | [
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0.01147... | 34,373 | 34373 | |
Sum to n of series
August 16th 2010, 11:13 PM
arze
Sum to n of series
If $S_n=\displaystyle \sum^n_{r=0} a^r(1+a+a^2+...+a^r)$, $(|a|eq 1)$ by considering $(1-a)S_n$, show that
$S_n=\frac{1-a^{2n+2}}{(1-a^2)(1-a)}-\frac{a^{n+1}(1+a^{n+1})}{(1-a)^2}$
State the set of values of a for which $S_n$approaches ... | 5 | [
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-0.06298828125,
-0.00909423828125... | 34,374 | 34374 | |
Word problems with differentiation (implicit, I think)
October 8th 2008, 02:50 PM #1
Newbie
Joined
Oct 2008
Posts
2
Word problems with differentiation (implicit, I think)
Doing homework/studying for test tomorrow.
"A street light is at the top of an 11 foot pole. A woman 6 feet tall walks away from ... | 5 | [
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0.0008544921875,
0.0668945... | 34,375 | 34375 | |
Homework Help
Posted by jane on Thursday, February 19, 2009 at 11:15pm.
given f(x) = abs(sin x) and g(x) = x^2 for all real x:
1) let H(x) = g(f(x)) and write an expression for it.
2) find domain and range of H(x).
3) find an equation of the line tangent to the graph of H at the point where x = pi/4.
• calculus ... | 5 | [
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-0.0... | 34,376 | 34376 | |
a little trouble finding the eigen vector here...
April 28th 2010, 04:05 AM #1
Member
Joined
Oct 2009
Posts
175
a little trouble finding the eigen vector here...
So I have original matrix
2 2 -2
0 1 0
0 0 1
with eigen values 2, 1, 1
i can find the eigen vector for the llamda 1 whic... | 4 | [
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How to teach factoring
December 2nd 2011, 04:52 AM #1
How to teach factoring
How i can teach my students how to factor numbers and variables
I teach them the distributive law
and the master it I tried to tell them that factoring is the anti of distributive law
any ideas
Re: How to teach factoring
... | 4 | [
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0.06982421... | 34,378 | 34378 | |
Help for Z transform of t^2
June 18th 2010, 09:27 PM
moonnightingale
Help for Z transform of t^2
I am unable to calculate Z transform of t^2 ( t Square)
Can any body show me step by step method to calculate its Z transform
June 18th 2010, 11:04 PM
CaptainBlack
Quote:
The (one sided) z-transform ... | 5 | [
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-0.052734375,
0.08... | 34,379 | 34379 | |
Permutation Help!
January 16th 2009, 12:33 PM #1
Newbie
Joined
Jan 2009
Posts
13
Permutation Help!
Consider the Permutations of the word SUCCESSFUL ?
a) How many permutations total?
b)How many have the 3 vowels adjacent (such as SUUESSFCLC)?
c)How many permuations have none of the 3 vowels a... | 4 | [
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-0.026611328125,
... | 34,380 | 34380 | |
Divide 4x^3 + 2x^2 + 10x - 7 by (x-5).
October 18th 2010, 03:51 AM #1
Newbie
Joined
Jul 2010
Posts
24
divide 4x^3 + 2x^2 + 10x - 7 by (x-5) using the long division..
this is polynomial method i think :/.. help please me..
Last edited by mr fantastic; October 18th 2010 at 04:21 PM. Reason: Re-tit... | 4 | [
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-0.0262451171875,... | 34,381 | 34381 | |
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versão On-line ISSN 0718-2813
Obras y Proyectos no.10 Concepción 2011
http://dx.doi.org/10.4067/S0718-28132011000200005
Obras y Proyectos 10, 47-61
Stability of slopes in residual soils
Estabilidad de taludes en suelos residuale... | 4 | [
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Homework Help
Posted by Jenny on Tuesday, October 13, 2009 at 6:25pm.
My digits are the same. Their sum is 3 less than their products. Who am I?
• math - Anonymous, Tuesday, October 13, 2009 at 6:40pm
33.
Same digits.
Sum: 3+3=6.
Products:3*3=9.
6=9-3. {Sum(6) is 3 less than products (9)}.
•... | 4 | [
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Homework Help
Posted by HELP!! on Wednesday, March 9, 2011 at 10:34am.
Find the derivative of f. you may simplify before differentiating
f(x)= x2-7x+12/x4-8x3+13x2+30x-72
• Calculus - Reiny, Wednesday, March 9, 2011 at 12:46pm
Surely you meant ...
f(x) = (x^2-7x+12)/(x^4-8x^3+13x^2+30x-72)
= (x-3)(x-... | 5 | [
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-0.0673828125... | 34,384 | 34384 | |
Proof of span(S) is a subspace:a question
April 6th 2011, 05:42 AM
x3bnm
Proof of span(S) is a subspace:a question
We know the definition of subspace which is:
If $W$ is a set of one or more vectors from a vector space $V$, then $W$ is a subsace of $V$ if and only if the following conditions hold:
(a) ... | 4 | [
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0.01483154... | 34,385 | 34385 | |
[SOLVED] Polynomial time/height
January 24th 2010, 12:02 AM #1
Junior Member
Joined
Nov 2009
From
Ornskoldsvik
Posts
33
Hey guys, I need help with this!
A ball is dropped from top of a building. Its height from the ground (in feet) after t
seconds is given by H (t) = – 16 t^2 + 320.
a) Gr... | 4 | [
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0.024658203125,
-0.02880859375... | 34,386 | 34386 | |
Circle Cordinate-Geomerty question, intersecting circles?
February 22nd 2009, 04:01 AM #1
Member
Joined
Feb 2009
From
Oxford
Posts
84
Any chance I could get a little help with the second part of this question, I've included my working for the first part in case I've messed it up.
Many thanks to an... | 4 | [
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0.01757... | 34,387 | 34387 | |
Inverse of a complex function
October 29th 2012, 05:07 AM
paulluap1991
Inverse of a complex function
hi, i have been set the following problem, where z is a complex number:
What is the domain of the function f(z) = (3z+1)/(z+i) ?
Prove that f, defined in the domain of f, has an inverse function (f-1),... | 5 | [
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... | 34,388 | 34388 | |
Mplus Discussion >> LGM Power Analysis
Message/Author
Chuck Cleland posted on Monday, December 23, 2002 - 7:18 am
I am trying to estimate power for a relatively simple LGM. The model specifies linear growth over 4 time points which is unrelated to intial status but dependent on a single covariate (a dummy
variable). He... | 5 | [
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Diff eqn- IVP
Posted by shasha on Saturday, March 12, 2011 at 7:03am.
A particle moves on the x-axis with an acceleration, a=(6t-4)ms⁻1. Find the position and velocity of the particle at t=3 , if the particle is at origin and has a velocity of when t=0
• Diff eqn- IVP - MathMate, Saturday, March 12, 2011 at 10:22am... | 4 | [
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... | 34,390 | 34390 | |
Derivative
Run the online derivative calculator: webMathematica Explorations: Step-by-Step Derivatives Derivative of: x*Tan[x]^(1/2) With respect to: x Gives: $\sqrt{\tan(x)} + \frac{x \sec^2(x)}{2\sqrt{\tan
(x)}}$ This is valid for $x > 0$ For $x < 0$, you have Derivative of: -x*Tan[x]^(1/2) With respect to: x which g... | 5 | [
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... | 34,391 | 34391 | |
Vertex!
May 10th 2012, 01:11 AM
Chuka
Vertex!
The function f(x) = x^2 - 18x + 83 achieves its minimum at (9,2). If g(x) = f(x-4)-3, where is the vertex of g(x)?
This problem is driving me crazy!!!!
Okay so far I've tried to do the shift thing. which I got: (13,-1)
Then I tried to just plug it in as... | 4 | [
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Latin American applied research
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versión impresa ISSN 0327-0793
Lat. Am. appl. res. v.36 n.2 Bahía Blanca abr./jun. 2006
Supervisory control of an HEV using an inventory control approach
L. V. Pérez^1, G. R. Bossio^1, D. Moitre^2 and G.... | 4 | [
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0.0234375,
-0.099609375,
-0.026611328125,... | 34,393 | 34393 | |
Spatial Interpolation Methodologies in Urban Air Pollution Modeling: Application for the Greater Area of Metropolitan Athens, Greece
1. Introduction
Air pollution in urban environments has serious health and quality of life implications. A wide variety of anthropogenic air pollution sources increase the levels of back... | 4 | [
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-0.002395629... | 34,394 | 34394 | |
Homework Help
Posted by mike on Thursday, September 30, 2010 at 2:02pm.
find the derivative of the function (6x+1)/(19x+1)^1/2
PLEASE EXPLAIN IM LOST
• calculus - Sarah, Monday, November 29, 2010 at 5:27am
You use the quotient rule of :[u'v -uv']/v^2
so:
u=(6x+1) v=(19x+1)^1/2
u'=6 v'= [1/2(19x+1... | 5 | [
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-0.08349609375,
0.03... | 34,395 | 34395 | |
Which point is closest to a specific line?
December 3rd 2009, 10:45 AM #1
Super Member
Joined
Nov 2008
Posts
597
Which point is closest to a specific line?
Question:
Find the point on the line
(I am not sure if this is calculus but my course is called calculus so if it isn't please don't ban me ... | 5 | [
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0.03173828125,
-0.0186767578125,
-0.0256347... | 34,396 | 34396 | |
the encyclopedic entry of identity matrices
In the fields of computer vision and image analysis, the Harris-affine region detector belongs to the category of feature detection. Feature detection is a preprocessing step of several algorithms
that rely on identifying characteristic points or interest points so to make co... | 4 | [
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-0.... | 34,397 | 34397 | |
Homework Help
Posted by Anonymous on Friday, June 22, 2012 at 8:13am.
Find all points on the graph of the function f(x) = 2 sin(x) + (sin(x))^2 at which the tangent line is horizontal. Consider the domain x = [0,2π).
• Calculus - Reiny, Friday, June 22, 2012 at 8:34am
f'(x) = 2cosx + 2sinx(cosx)
= 0 when t... | 4 | [
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-0.1044... | 34,398 | 34398 | |
Basis for the Subspace W of R5 ; Answer Check!
September 7th 2012, 12:41 AM
Pandp77
Basis for the Subspace W of R5 ; Answer Check!
Hey Guys on MHF.
I had a Basis and Subspace question and I was wondering if you could help check my answer and my working, and point me in the right direction if I've made a mist... | 5 | [
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-0.... | 34,399 | 34399 |