content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Simple Integration problem: Trigonometric Integration
February 19th 2010, 10:42 AM #1
Newbie
Joined
Apr 2009
Posts
8
Simple Integration problem: Trigonometric Integration
I'm not sure what I did wrong here, or if the integral calculator has given me an equivalent answer, I'll try my best to explain.
... | 5 | [
-0.0419921875,
0.025634765625,
0.0791015625,
0.04931640625,
0.03955078125,
-0.042236328125,
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-0.0869140625,
-0.01544189453125,
0.021484375,
0.0106201171875,
-0.0400390625,
-0.056396484375,
0.031982421875,
-0.01904296875,
-0.0194091796875,
0.0281982421875,
-0.02770996... | 21,000 | 21000 | |
Second derivatives using implicit differentiation
October 17th 2010, 02:47 PM
Ulysses
Second derivatives using implicit differentiation
Hi there. Well, I wanted to know how to find the second derivatives of a function using implicit differentiation. Is it possible? I think it is. I think I must use the chain rul... | 5 | [
0.04150390625,
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0.0859375,
0.0257568359375,
0.01336669921875,
0.10595703125,
0.0223388671875,
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0.01397705078125,
0.08349609375,
0.08203125,
-0.07666015625,
0.0322265625,
... | 21,001 | 21001 | |
linear algebra proof help!
April 7th 2009, 12:21 AM
gavin1989
linear algebra proof help!
Let S = {V1,…vn} be a linearly independent set in a vector space V. Suppose w is in V, but w is not in span(S). Prove that the set T = {V1,…Vn,w} is a linearly independent set.
since it says w is in v, does it mean th... | 5 | [
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0.125,
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0.049072265625,
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0.019775390625,
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-0.0218505859375,
-0.0120849609375,
-0.07861328125,
0.0... | 21,002 | 21002 | |
Perpendicular Vector
May 7th 2008, 05:18 PM #1
Perpendicular Vector
If I'm given an algebraic vector as an ordered triple (1, 2, 3) and that's it, how would I go about finding vectors that are perpendicular to this one?
I need to use the dot product.
My book didn't show examples of such a problem, so I'... | 4 | [
-0.1279296875,
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0.0673828125,
-0.0164794921875,
-0.0546875,
0.031005859375,
0.00701904296875,
-0.0206298... | 21,003 | 21003 | |
Solving coefficients for cubic polynormial
May 1st 2013, 07:54 AM #1
Junior Member
Joined
Feb 2010
Posts
30
Solving coefficients for cubic polynormial
I'm not sure if Advanced Algebra is the correct forum for this, but if not maybe it can be moved elsewhere?
Anyways, I am taking this class where we ... | 5 | [
-0.06201171875,
0.000659942626953125,
0.000339508056640625,
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0.06689453125,
0.01214599609375,
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0.043212890625,
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0.040283203125,
-0.01177978515625,
0.00084686279296875,
0.043212890625,
-0.04345703125,
0.11865234375,
... | 21,004 | 21004 | |
limit superior proof
October 29th 2007, 03:26 PM #1
Junior Member
Joined
Sep 2006
Posts
32
limit superior proof
I was wondering if someone could show me how to do this proof:
If yn converges to L and xn is a bounded sequence, show that
limsup(xn + yn) = limsup(xn) + L.
Thanks for any help. ... | 5 | [
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0.08203125,
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0.0751953125,
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0.00897216796875,
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0.05322265625,
0.0189208984375,
0.072265625,
-0.0169677734375,
0.0228271... | 21,005 | 21005 | |
Ratio of 3 things
April 19th 2013, 10:53 AM #1
Member
Joined
Mar 2012
Posts
94
Ratio of 3 things
To make FoundaMix concrete I need cement, sand, and aggregate mixed in the ratio 2 : 5 : 7. I need 7 tonnes of concrete for a driveway. How much of each material should I buy?
---------------
I need ... | 4 | [
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0.12060546875,
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0.06201171875,
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0.088867187... | 21,006 | 21006 | |
10 millimolar (mM) to 250 micromolar -
10 millimolar (mM) to 250 micromolar - (Aug/28/2012 )
ascacioc on Wed Aug 29 18:49:09 2012 said:
useful formulae:
concentration (in M)= mass (in grams)/MW (in grams/mol)/volume (in L); since you know your concentration, volume and MW --> mass of substance in grams = volume (in... | 4 | [
0.055419921875,
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0.037109375,
0.07470703125,
-0.052490234375,
0.004852294921875,
0.00323486328125,
0.0732... | 21,007 | 21007 | |
expected value of a segment of normal distribution
April 18th 2007, 11:51 PM #1
fio_2001
Guest
expected value of a segment of normal distribution
I need to find the expected value of a segment (namely the segment -infinity to C) of the normal distribution (the bell curve).
i know what i should integrate, I j... | 5 | [
-0.034912109375,
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-0.00150299072265625,
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0.0263671875,
... | 21,008 | 21008 | |
Math Help
May 28th 2007, 07:40 PM #1
Newbie
Joined
May 2007
Posts
8
A pair of 8-sides dice have sides numered 1 through 8.Each side has same probability of landing face up.What is the probability that the product of the two numbers on the sides that land face up
exceeds36? Why?
I will very apprec... | 4 | [
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0.0201416015625,
0.01470947265625,
-0.038330078... | 21,009 | 21009 | |
limit of 2^x - 32 / x-5
September 26th 2009, 12:58 PM #1
Newbie
Joined
Sep 2009
Posts
18
i can't figure it out for some reason it's weird!
each limit represents the derivative of some function "f" at some number "a". state such an "f" and "a" in each case.
limit as x-->5
2^x - 32 / x-5
... | 4 | [
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... | 21,010 | 21010 | |
Coefficient Bounds for Certain Subclasses of Analytic Functions Defined by Komatu Integral Operator
International Journal of Mathematics and Mathematical Sciences
Volume 2012 (2012), Article ID 309465, 9 pages
http://dx.doi.org/10.1155/2012/309465
Research Article
Coefficient Bounds for Certain Subclasses of Analytic... | 5 | [
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0.032958984375,
-... | 21,011 | 21011 | |
Wolfram Demonstrations Project
Semenov's Algorithm for Solving Systems of Nonlinear Equations
An algorithm due to V. Yu. Semenov computes all the roots that lie in some rectangular domain of of a system of equations (not necessarily polynomial) given by a function , provided the system has
no repeated roots in the dom... | 4 | [
-0.09326171875,
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-0.09619140... | 21,012 | 21012 | |
Limit question
April 22nd 2009, 08:38 PM #1
Newbie
Joined
Apr 2009
Posts
6
Limit question
I have the integral of tanx dx integrating from 0 to pi. Because of the asymptote at pi/2 I split the integral up but when I work it all out i get infinity - infinity? which is undefined. How
could I rewrite thi... | 5 | [
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-0.0341796875,
-0.04736328125,
0... | 21,013 | 21013 | |
If e and e' are eccentricities of hyperbola
December 4th 2009, 02:25 PM #1
Banned
Joined
Dec 2008
From
Mauritius
Posts
523
If e and e' are eccentricities of hyperbola
Question :
If e and e' are eccentricities of hyperbola and its conjugate, prove that
$<br /> \left(\frac{1}{e^2} \right) + \l... | 4 | [
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0.035400390625,
-0.01806640625,
-0.08... | 21,014 | 21014 | |
Help with Stokes Theorem
September 4th 2009, 07:26 PM #1
Newbie
Joined
Sep 2009
Posts
1
Help with Stokes Theorem
The question states: F(x,y,z)=(y-z, 7z-8, x-7y). Compute line integral F.ds along the unit circle c(t)=(cos(t), sin(t), 0), 0<=t<=2pi.
So by doing the line integral F(c(t)).c'(t) you get ... | 5 | [
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0.0264892578125,
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-0.05297851... | 21,015 | 21015 | |
The Low Return of High Yield
Over the last few weeks, as High Yield indices’ yields have continued to fall, we have seen a lot of commentary from talking heads (which, presumably, once belonged to the now-headless chickens doing
the actual trading) about a potential bubble in high yield corporate bonds. This talk is o... | 4 | [
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-0.0400390625,
... | 21,016 | 21016 | |
Proving inverse functions identity
September 13th 2012, 06:35 AM #1
Newbie
Joined
Sep 2012
From
Colombia
Posts
4
Proving inverse functions identity
Hello everybody and thanks for reading.
I have been trying to solve the following problem without success, so I am looking for some advices..
I ... | 5 | [
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0.0546875,
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0.04443359375,
-0.10... | 21,017 | 21017 | |
Area of a Segment from Arc and Chord Length
Date: 11/27/2000 at 11:07:32
From: Donald Castricone
Subject: Area
Dear Dr. Math,
Is it possible to find the area of a segment (minor segment) of a
circle given ONLY the chord length and the arc length? Can it be done
using geometry, trigonometry, and algebra, or only wit... | 5 | [
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0.020263671875,
0.0147705078125,
0.037... | 21,018 | 21018 | |
Patent US20040267860 - Complex multiplication method and apparatus with phase rotation
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates generally to multiplication of complex numbers. More specifically, but without limitation thereto, the present invention relates to a... | 4 | [
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0.032470703125,... | 21,019 | 21019 | |
finding expression and combining like terms
February 21st 2007, 03:00 PM
Patience
finding expression and combining like terms
1. A triangle has sides 3x + 7, 4x , and 5x + 6. Find the expression
that represents its perimeter.
Combining like terms
2. 7(4w-3)-25w
February 21st 2007, 05:09 PM
... | 4 | [
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0.0322265625,
-0.... | 21,020 | 21020 | |
Help with factoring
October 16th 2006, 04:33 PM
Taylor
Help with factoring
I need to factor these four problems:
2
3x -1/3
2
(y-5) -36
2
(2y-7) -1
16
x -1
PLEASE, please please help me!!!!!:(
October 16th 2006, 04:40 PM
ThePerfectHacker
October 16th 2006, 04:55 PM
... | 4 | [
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0.0439453125,
-0.0947265625,
0.002700... | 21,021 | 21021 | |
Please Help Final Tom!! Word Problem
November 30th 2007, 05:24 PM #1
Newbie
Joined
Oct 2007
Posts
5
Can someone please explain how to set up the equation for the following word problem,
-Express the surface area (S) of a rectangular box with a square base and of volume 100 ft.3 in terms of the length ... | 4 | [
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0.056884765625,
-0.0269... | 21,022 | 21022 | |
Average Value of a Function with Linear Constraints
May 13th 2009, 07:36 AM #1
Newbie
Joined
May 2009
Posts
2
Average Value of a Function with Linear Constraints
Assume:
x1, , xn where 0<= xi <= 1
a1, ., an are positive real constants.
A = Another Positive real contant
Where,
Sum... | 4 | [
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0.08642578125,
0.0086669... | 21,023 | 21023 | |
stocks question..
August 13th 2009, 11:20 AM #1
MHF Contributor
Joined
Nov 2008
Posts
1,401
stocks question..
calculate
$<br /> \iint_{M}^{}rot(\vec{F})\vec{dS}<br />$
where
$<br /> \vec{F}=(y^2z,zx,x^2z^2) <br />$
M is a part of $z=x^2+y^2$ which is located in $1=x^2+y^2$
and its nor... | 5 | [
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0.11328125,
0.01611328125,
0.01446533203125,... | 21,024 | 21024 | |
Line integral along the curve
Given that A= yai+xaj, P1(1,1,-1) and P2(8,2,-1) evaluate integral from P1 to P2 (A.dl) along the curve x=y^3.
Is the question $\displaystyle \int_C \left(ay\mathbf i + ax\mathbf j\right) \, ds$, where $\displaystyle C$ is the curve $\displaystyle x = y^3$ from $\displaystyle P_1(1,1,-1)$... | 5 | [
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0.041015625,
-0.083984375,
0.03... | 21,025 | 21025 | |
Where is logic flaw?
August 19th 2009, 05:12 PM #1
Junior Member
Joined
Feb 2009
Posts
42
Where is logic flaw?
Hi guys
Here is the question:
Jenny has 228 more marbles than jack. if bob gave each of them 133 marbles, she will have twice as many marbles as jack. How many marbles does jenny have?... | 4 | [
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0.005065917968... | 21,026 | 21026 | |
Proving a distribution convergs to a standard normal distribution
March 29th 2010, 09:22 AM #1
Newbie
Joined
Mar 2010
Posts
17
Proving a distribution convergs to a standard normal distribution
Y has a binomial distribution based on n trials and success probability p. Then the point estimator (pn=Y/n) is ... | 4 | [
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0.005401611328125,
-0.01080322265625,
0.03515625,
-0.0... | 21,027 | 21027 | |
Adaptive Probabilistic Proactive Routing for Dense MANETs
Journal of Computer Networks and Communications
Volume 2012 (2012), Article ID 234824, 10 pages
http://dx.doi.org/10.1155/2012/234824
Research Article
Adaptive Probabilistic Proactive Routing for Dense MANETs
^1HANA Research Group, Ecole Nationale des Science... | 4 | [
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Bertrand's Ballot Theorem (Random Walk)
November 20th 2007, 03:53 AM #1
Member
Joined
Oct 2007
Posts
145
Bertrand's Ballot Theorem (Random Walk)
J.Bertrand's Ballet Theorem stated that the probability of p leading q in a random walk is:
${{p-q} \over{p+q}}$ given that p>q.
Bertrand's ballot theor... | 5 | [
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... | 21,029 | 21029 | |
Questions about factoring an equation with 3rd degree and 2nd degree
April 7th 2011, 08:58 AM #1
Junior Member
Joined
Feb 2011
From
Canada
Posts
27
$2x^3+3x^2-1$
This is the equation that needs to be fully factored. So, from what I see here it would be impossible to factor it normally, since 1 ca... | 4 | [
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-... | 21,030 | 21030 | |
Patent US5426541 - Self-equalization method for partial-response maximum-likelihood disk drive systems
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a direct access storage device (DASD) of the type utilizing partial-response signaling and maximum-likelihood (PRML) d... | 4 | [
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0.02624511718... | 21,031 | 21031 | |
Patent US4071842 - Apparatus for analog to digital conversion
This application is a division of application Ser. No. 608,524 filed Aug. 29, 1975.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to conversion of analog signals to digital signals and, more particularly to ... | 4 | [
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Posts about calculus on Lucky's Notes
If you’ve taken any intro to Calculus class, you’re probably familiar with partial fraction decomposition.
In case you’re not, the idea is that you’re given some rational function with an awful denominator that you want to integrate, like:
$\frac{4x-2}{(x-2)(x+4)}$
And you break... | 5 | [
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... | 21,033 | 21033 | |
Differentiation - GNU Emacs Calc Manual
11.5.1 Differentiation
The a d (calc-derivative) [deriv] command computes the derivative of the expression on the top of the stack with respect to some variable, which it will prompt you to enter. Normally, variables in
the formula other than the specified differentiation variab... | 4 | [
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Finding the maximum and minimum points of a cosine function...
P: 492
1. The problem statement, all variables and given/known data
This is part of a larger engineering problem, I have reduced it to this mathematical equation, which should be simple, right?
I need to find when the following EQ has Maximum's (in terms... | 4 | [
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Finding the area using Pythagoras
December 24th 2010, 12:18 AM #1
Newbie
Joined
Dec 2010
Posts
7
Finding the area using Pythagoras
Hello;
I am trying to solve what must be a ridiculously simple problem involving Pythagoras’ theorem and some simple geometry but I seem to be missing something. The pro... | 5 | [
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Several questions I didn't get
March 5th 2008, 04:40 PM #1
A couple questions I didn't get
I did several pages of calculus for homework, and these are the questions I got stuck on:
1. Find the derivative of y=2/√x + x/√3 + 6(x)^1/3.
2. Find the derivative at x= -2 for y=3u²+2u and u = √(x²+5).
3. T... | 5 | [
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... | 21,037 | 21037 | |
12 = 11x - 14x
March 4th 2006, 07:55 AM
Euclid Alexandria
12 = 11x - 14x
Any hints on where I went wrong?
$12 = 11x - 14x$
$12 = -3x$
$12/-3 = -3x/-3$
$-4 = x$
When checking the solution in the original equation, I got the false answer of:
$12 = 11(-4) - 14(-4)$
$12 = -44 - 56$
... | 4 | [
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0.0247802734... | 21,038 | 21038 | |
Help Me Factor Please
February 12th 2006, 05:17 PM #1
soca615
Guest
I really need some help factoring some equations please. These don't neccessarily have to be in the real numbers either so
1.) 4x^4 + 3x^2 - 1
2.) 9c^4 + 5c^2 + 1
3.) x^3 + x^2 + 4
4.) (a+b)^2 + 7(a+b) + 12
soca615
I re... | 4 | [
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A^3 + a + - 10 = 0
March 30th 2011, 05:06 PM #1
Member
Joined
Jul 2010
Posts
85
A^3 + a + - 10 = 0
My directions were:
Solve algebraically
A^3 - B = 5
A + B = 5
I added the equations and got A^3 + A = 10
I realize 2 is the solution but cannot figure out how to do it algebraically. ... | 4 | [
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Determining the density of a stellar object
1. The problem statement, all variables and given/known data
Hello all. I am new to physics but am quite competent in maths and other sciences. I am studying Open University's Exploring Science module and this one question has me stumped. I follow all of the
instructions but ... | 4 | [
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... | 21,041 | 21041 | |
Patent US6967899 - Method for classifying a random process for data sets in arbitrary dimensions
STATEMENT OF GOVERNMENT INTEREST
The invention described herein may be manufactured and used by or for the Government of the United States of America for Governmental purposes without the payment of any royalties thereon o... | 4 | [
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-0.... | 21,042 | 21042 | |
Primes, divisibility
December 1st 2010, 10:59 AM #1
Member
Joined
Aug 2008
Posts
91
Primes, divisibility
Given are two different primes $a,beq 2$. Show that $2^{ab}-1$ has at least three different prime divisors.
How would I go about first of all?
Think about the formula for a geometric progres... | 5 | [
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On Switched Control Design of Linear Time-Invariant Systems with Polytopic Uncertainties
Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 595029, 10 pages
http://dx.doi.org/10.1155/2013/595029
Research Article
On Switched Control Design of Linear Time-Invariant Systems with Polytopic Uncertainties
... | 5 | [
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Math Help
August 21st 2012, 06:58 PM #1
Newbie
Joined
Aug 2012
From
Chile
Posts
17
Ring
Hi! I need help with this exercise :
1)Let R be a ring with 1 .Prove that $(-1)^2=1$ in R
another question , if I have to "u" is a unit in R, "-u" is a unit ? how i prove this ?
Thanks
Re: Ring
... | 5 | [
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Poisson distribution
March 2nd 2009, 03:31 AM #1
Poisson distribution
It's only the last two parts of this I'm having a bit of bother with, but I'll type the whole question out so you know what's going on.
Suppose that the number of times during a year that an individual catches a cold can be modelled by a... | 4 | [
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Finding a set of Generators for a group G when Generators for Kerh, Imh are known; h
My thoughts are this:
Take [tex]\{a_1,...,a_n\}[/tex] generators of ker(f), and take [tex]\{b_1,...,b_m\}[/tex]generators of im(f). For every b[i], we can find a c[i] such that [tex]f(c_i)=b_i[/tex]. Then [tex]\
{a_1,...,a_n,b_1,...,b... | 5 | [
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0.1088867187... | 21,047 | 21047 | |
factorization of number
November 10th 2010, 12:13 AM #1
Newbie
Joined
Nov 2010
Posts
11
factorization of number
I have written a C code program for factorization of a given number into two divisors, when the two divisors are having approximately the same number of digits . It cannot check for prime
n... | 4 | [
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roof by induction
June 29th 2010, 01:28 PM #1
Junior Member
Joined
Jun 2010
Posts
36
Proof by induction
hi the link to this question is here http://i223.photobucket.com/albums/d...f/HPIM0535.jpg
Question 8. I think I was OK in the first part with proving 2n(2n+1) is always odd.
However I am lost ... | 4 | [
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0.0055847167968... | 21,049 | 21049 | |
Calculation of rate of climb (vertical velocity)
caslav.ilic
[...] it seems unlikely to me that a 4 kW engine could weigh so little that the gross takeoff weight of the whole UAV is only 20 kg.
Well, after googling a bit, you can forget about this statement of mine. I thought that the engine wouldn't have power-to-we... | 4 | [
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Single Peak Solitons for the Boussinesq-Like
International Journal of Partial Differential Equations
Volume 2013 (2013), Article ID 732809, 7 pages
http://dx.doi.org/10.1155/2013/732809
Research Article
Single Peak Solitons for the Boussinesq-Like Equation
^1School of Science, Huzhou University, Huzhou, Zhejiang 31... | 5 | [
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Drug Release Kinetics from Polymer Matrix through Fractal Approximation of Motion
Smart Materials Research
Volume 2012 (2012), Article ID 264609, 8 pages
http://dx.doi.org/10.1155/2012/264609
Research Article
Drug Release Kinetics from Polymer Matrix through Fractal Approximation of Motion
^1Department of Natural an... | 4 | [
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Patent US20030086339 - Digital clock recovery circuit
RELATED APPLICATION
[0001] This application claims the benefit of U.S. Provisional Application No. 60/304,251, filed on Jul. 10, 2001. The entire teachings of the above application are incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002]FIG. 1 is ... | 4 | [
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0... | 21,053 | 21053 | |
Problem involving work
February 17th 2009, 05:36 PM #1
Newbie
Joined
Feb 2009
Posts
5
Problem involving work
I think I figured it out but here is the problem
One person can do a task in 10hrs, a second can do it in 15 and the third can do it in 20. Together how long will it tak
so here is what I ... | 4 | [
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-0.01446533203... | 21,054 | 21054 | |
inverse using modulo congruence
October 25th 2006, 06:28 AM #1
Member
Joined
Nov 2005
Posts
111
inverse using modulo congruence
Hi ,
Please can you help me with this problem .
I need to find the inverse of 2 modulo 11 using gcd(11,2) and modulo congruence.
I know I can start like this:
... | 5 | [
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0.01318359375,
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0.032470703125,
0.0424... | 21,055 | 21055 | |
Complicated Combinatorics Problem
April 8th 2010, 11:50 AM #1
Banned
Joined
Apr 2010
Posts
6
Complicated Combinatorics Problem
In how many ways can a we arrange, in a row, six balls... when we have to choose from seven non-unique cricket balls, six non-unique tennis balls and five non-unique squash balls... | 5 | [
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Patent US6678868 - Using Boolean expressions to represent shapes within a layout of an integrated circuit
BACKGROUND
1. Field of the Invention
The present invention relates to the process of designing an integrated circuit. More specifically the present invention relates to a method and an apparatus that uses Boolean... | 5 | [
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0.0307617187... | 21,057 | 21057 | |
Help with Calculating the Cross and Dot Product
September 12th 2012, 11:00 AM #1
Newbie
Joined
Sep 2012
From
Atlanta
Posts
3
Help with Calculating the Cross and Dot Product
I have figured out how to determine the Dot product becasue it is fairly straight forward. However the Cross product seems to be... | 5 | [
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0.01501464843... | 21,058 | 21058 | |
Trignometric Integrals
February 9th 2010, 07:22 PM #1
Junior Member
Joined
Jan 2010
Posts
47
Trignometric Integrals
$<br /> \int \frac{x^2}{\sqrt{4-x^2}} dx<br /> <br />$
$<br /> <br /> \int sin^2(x)cos^3(x) dx<br /> <br />$
I cant figure these 2 out.
Can you also show the steps?
Thank ... | 4 | [
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-0.... | 21,059 | 21059 | |
Proper distance in GR
You are welcome yuiop, I definitely can use some practice in checking mistakes in formulas as the formulas I write myself are often full of mistakes.
I attempted to generalize the formulas to obtain the proper velocity of a free falling observer wrt a local stationary observer, in the attempt to... | 4 | [
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Patent US4937769 - Apparatus and method for reducing transient exponential noise in a sinusoidal signal
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an apparatus and method which reduces transient exponential noise in sinusoidal signals and has particular application in reducing suc... | 4 | [
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... | 21,061 | 21061 | |
Arithmetic series.
December 20th 2010, 09:09 AM #1
Newbie
Joined
Dec 2010
Posts
8
Arithmetic series.
Not sure if this is the right section to be posting in but here goes.
From a piece of wire 5000mm long, n pieces are cut, each being 10mm longer than the previous piece. If ui is the length of the it... | 4 | [
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Solving a simple equation
August 30th 2009, 08:00 PM
jelloish
Solving a simple equation
My friend asked me for math help for her pre-calc class and I can't for the life of me do the problem--- I'm out of practice.
Solve for x:
x^4-3x^2+2=0.
August 30th 2009, 08:08 PM
Wilmer
August 30th 2009, 08:10 PM... | 4 | [
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Parametric equations for Tangent line of an ellipse
You are being much too complicated!
First the problem asked for parametric equations for the tangent line. It is not necessary to get parametric equations for the ellipse,.
Yes, with y= 2, your equation reduces to [itex]4x^2+ z^2= 8[/itex]. From that you can calcula... | 5 | [
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... | 21,064 | 21064 | |
trouble finding critical points on a function, R^2 -> R
October 6th 2012, 05:53 PM #1
Newbie
Joined
Jan 2010
Posts
17
trouble finding critical points on a function, R^2 -> R
Q: Find the local maximum and minimum values and saddle point(s) of the function
$f(x, y) = (x^2 + y^2)e^{y^2 - x^2}$
I've... | 5 | [
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... | 21,065 | 21065 | |
rational expression
simplify. 1. (x^2+3)/x^2 + (x-1)/5 I get (x+2)/5, is this correct?
I don't know how you arrived at your conclusion so I don't know where to correct you. If you're simplifying by putting everything over one denominator, then we need an LCD. That would be $5x^2$ $\
frac{x^2+3}{x^2}+\frac{x-1}{5}=\fra... | 4 | [
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Pascal-Fibonacci Proof
October 3rd 2009, 04:13 PM
Tulki
Pascal-Fibonacci Proof
Every once in awhile our Professor asks us a challenge question for "fun". Well, I'm totally stumped this time.
He's asked us if we can prove the Fibonacci sequence. So far, we've only learned Set Theory, Combinatorics, and the b... | 5 | [
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Patent US7076726 - Method for matching rate in mobile communication system
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mobile communication system, and more particularly, to a method for matching a rate, in which puncturing or repetition is applied to each bitstream on tra... | 4 | [
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Parabolic Fractional Maximal Operator in Modified Parabolic Morrey Spaces
Journal of Function Spaces and Applications
Volume 2012 (2012), Article ID 543475, 20 pages
http://dx.doi.org/10.1155/2012/543475
Research Article
Parabolic Fractional Maximal Operator in Modified Parabolic Morrey Spaces
^1Department of Mathem... | 5 | [
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tangent to graph and parallel to
January 25th 2010, 11:12 PM #1
tangent to graph and parallel to
find an equation of the line that is tangent to the graph of
$f(x) = \frac{1}{\sqrt{x}}$
and parallel to the line of $x + 2y - 6 = 0$
I know that
$\frac {d}{dx} \left(\frac{1}{\sqrt{x}}\right) = -\... | 5 | [
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-0.0201416015625... | 21,070 | 21070 | |
pythagorean
August 20th 2008, 01:41 AM
helloying
pythagorean
A line cuts the x-axis at A(4,0) and the y-axis at B(0,3). Find the perdpendicular distance from O to L where O is the orgin. I took by the pythagors theorem 4² = 2.5² + ans²
2.5 is half of the lenght of the line. Am i correct to do it this way?
A... | 4 | [
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Lectures.html
LECTURE NOTES
Scanned and powerpoint lecture notes.
WARNING: downloading the lecture notes and putting them under your pillow at night will not help you learn the material.
Same for putting the textbook under your pillow. I tried it for many years without success.
If you would like to have the movie... | 4 | [
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... | 21,072 | 21072 | |
Multiplying and Dividing Polynomials?
Simplifying? I got the answer $36c^4b^6a^2$for the problem $(-2ab^5)(-6abc)(3c^3)$.Could you show me how you would solve these expressions? $(-3a^2b^2+7)(-6ab+2)$ $(x+3)(2x^2+7x+1)$
To simplify the expression $(-3a^2b^2 + 7)(-6ab + 2)$, distribute both $-3a^2b^2$ and $7$ into $(-6... | 4 | [
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Moment-generating function of a continuous variable
October 12th 2013, 08:40 AM
phys251
Moment-generating function of a continuous variable
I am having a tough time with these. For instance, take the following distribution: f(x) = 1, 0<x<1, and f(x) = 0 elsewhere. Now I was under the impression that I had to int... | 5 | [
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section of
f(a,b) = ... +a^6b^10 +a^3b^6 +ab^3 +b +1 +a +a^3b +a^6b^3 +a^10b^6 +...
and, surprisingly, it has an infinite product expression as follows
y(q) = 1 - q - q^2 + q^5 + q^7 - q^12 - q^15 + q^22 + ... .
It appears that each term is a power of
q y(q^24) = q -q^25 -q^49 +q^121 +q^169 -q^289 +... .
It appea... | 4 | [
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Patente US8140272 - System and method for unmixing spectroscopic observations with nonnegative matrix factorization
RELATED APPLICATIONS
This application claims priority to U.S. Provisional Application No. 61/072096, fled Mar. 27, 2008, and is incorporated herein by reference in its entirety.
BACKGROUND
The present ... | 4 | [
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... | 21,076 | 21076 | |
Physics Forums - View Single Post - PROVING INTERSECTION OF Any number of COMPACT SETS is COMPACT?
I'm stuck ...
Ive proved the intersection of any number of closed sets is closed ...
and Let S = { A_a : a Element of I } be an collection of compact sets...then
by heine Borel Theorem ...Each A_a in S is closed...so thi... | 4 | [
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... | 21,077 | 21077 | |
Local extrema in multiple variables
April 20th 2009, 06:56 PM #1
Super Member
Joined
Mar 2006
Posts
705
Thanks
2
Local extrema in multiple variables
Suppose that the function $f: \mathbb {R} ^n \rightarrow \mathbb {R}$ has first order partial derivatives and that the point $x \in \mathbb {R} ^n$ is a... | 5 | [
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-0.0... | 21,078 | 21078 | |
College algebra.
July 12th 2009, 04:22 PM
xbchgrl04x
College algebra.
I need help with a few practice problems:
1.) 8x^-2 - 2x^-1 + 1 = 0
2.) Value of y?
-2x + 3z = 17
x - 2y - z = -3
-4x - 3y - z = 19
3.) Tasty Bakery sells three kinds of muffins: chocolate chip muffins at 15 cents... | 4 | [
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0.0751953125,
0.005462646484375,
-0.01745... | 21,079 | 21079 | |
Math Help
What is the limit of x->1 sinpi*x/(1-x)^2? I want to solve it without using L'Hospital rule.
Hint: use the identity $\sin(\pi-\theta)=\sin(\theta)$ and $\lim_{x\to c}(f(x)\cdot g(x))=\lim_{x\to c}f(x)\cdot\lim_{x\to c}g(x)$ and a two-sided limit. What do you find?
No...I'm sorry but that makes no sense to ... | 5 | [
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0.043701171... | 21,080 | 21080 | |
Find Parametric Equation for Moving Particle
October 11th 2010, 08:04 AM #1
Newbie
Joined
Oct 2010
Posts
7
Find Parametric Equation for Moving Particle
Hello. I am familiar with parametric equations but the way this one is being asked is throwing me off.
Find parametric equations for the path of a p... | 4 | [
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0.0123291015625,
0.0164794921875,
0.072265625,
-0.06591796875,
-0.03... | 21,081 | 21081 | |
Integrating Maxwell-Boltzmann speed distribution
1. The problem statement, all variables and given/known data
Let P(v) represent the Maxwell-Boltzmann speed distribution. Basically what it comes down to is that I have to find the definite integral (0,inf) of P(v)*v^2 and get v[rms] from this.
2. Relevant equations
W... | 4 | [
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0.00118255615234375,
0.0185546875,
0.01... | 21,082 | 21082 | |
Differentiating natural logs
June 19th 2010, 06:38 PM
Celestiax
Differentiating natural logs
I'm having a little trouble differentiating these two functions, if anyone could help I would greatlyyy appreciate it.
g(x) = ln (x * sqrt(x^(2)-1))
and
f(u) = ln u / (1+ln(2u))
Whatever I do that mak... | 5 | [
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0.00747680664062... | 21,083 | 21083 | |
inverses of matrices
October 26th 2007, 09:43 AM #1
inverses of matrices
I know that:
$\begin{bmatrix} a & b \\ c & d \end{bmatrix}^{-1}=\frac{1}{Determinant} \begin{bmatrix} d & -b \\ -c & a \end{bmatrix}$
But what is the equivalent expression for 3x3 (or higher dimensional matrices)?
Thanks
L... | 4 | [
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Another Mathmatical Problem..
August 7th 2006, 11:11 AM #1
Junior Member
Joined
Aug 2006
Posts
36
Another Mathmatical Problem..
Problem:
The following experimental data values of x and y are believed to be related by the law y = mx^2 + c, where m and c are constants. By plotting a suitable graph, ve... | 4 | [
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Results on Difference Analogues of Valiron-Mohon'ko Theorem
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 273040, 6 pages
http://dx.doi.org/10.1155/2013/273040
Research Article
Results on Difference Analogues of Valiron-Mohon'ko Theorem
^1Department of Mathematics, Guangdong University of Education, G... | 5 | [
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Physics Forums - View Single Post - Finding the sum of a series
Finding the sum of a series
It's a very interesting question. There are various techniques for solving such. For example,
[tex]\sum_{n=1}^{\infty} \frac{1}{n^2}=\frac{\pi^2}{6}[/tex]
This can be solved by using Fourier coefficients and Parseval's Theor... | 5 | [
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0.0084... | 21,087 | 21087 | |
Prove: For T Compact, left or right invertible implies invertible
1. The problem statement, all variables and given/known data
[itex]X[/itex] is a Banach space
[itex]S\in B(X)[/itex] (Bounded linear transformation from X to X)
[itex]T\in K(X)[/itex] (Compact bounded linear transformation from X to X)
[itex]S(I-T)=I[/i... | 4 | [
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0.0180664062... | 21,088 | 21088 | |
finding length in truss
December 1st 2006, 07:16 AM #1
Newbie
Joined
Nov 2006
Posts
14
Find the lengths of BF and CF?
i have found that BF is 4779 i now need to know how to find CF
Hello, Zak!
Find the lengths of BF and CF.
i have found that BF is 4779 ... i now need to know how t... | 4 | [
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... | 21,089 | 21089 | |
Integral - Show me the steps?
September 16th 2012, 10:18 PM #1
Newbie
Joined
Sep 2012
From
United States
Posts
6
Integral - Show me the steps?
Hello,
The problem I'm working on is:
The integral of: (x^2 + 2)/(x+1)^2
Can you please step me through this problem?
Thanks!
Re: Integra... | 4 | [
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2 problem exam questions
December 29th 2008, 05:32 AM #1
Junior Member
Joined
Dec 2008
From
England - Warwickshire
Posts
25
2 problem exam questions
Hey i need to complete the following exam questions for my tutor for tomorrow but i am having trouble understanding them:
1. Show that $x^2+x+1>0$ ... | 5 | [
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Urgent: ......differential equation (another).
February 6th 2008, 01:26 PM #1
Newbie
Joined
Feb 2008
Posts
4
Hi it's me again.
I have another couple of problems I need to solve. (Same as before I have no idea what I am doing, so as much detail as you are willing to give, will be greatly appreciated).... | 5 | [
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... | 21,092 | 21092 | |
[SOLVED] find volume..
September 14th 2008, 02:08 PM #1
Member
Joined
Apr 2008
Posts
171
[SOLVED] find volume..
i cannot figure this out for the life of me.. find the volume of these functions using disk method:
y^2= x , x = 2y ; flip about the y - axis...
answer is 64pie/15
i m sure not... | 5 | [
0.0703125,
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Quadratic Regression Calculator
What is Quadratic Regression?
Quadratic regression is a form of
multiple linear regression
since the equation
y = ax² + bx + c
is linear in the variables a, b, and, c, which are the undetermined coefficients of the quadratic equation in x. Since a, b, and c are bound in a linear re... | 5 | [
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0.0070... | 21,094 | 21094 | |
Are these functions injective/surjective etc?
October 25th 2012, 10:34 AM
misqa88
Are these functions injective/surjective etc?
1. Let f : R -> R be the function given by f(x) = x^3 - x^2 - 2x.
(a) The function f is injective.
(b) The function f is surjective.
(c) f^-1({0}) = {0}
(d) -1 ∈ f(R)
... | 5 | [
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s the planet Nibiru?
┌─────────┬───────────────────┬──────────┬───────────────┐
│Home Page│Astronomy Articles │Stars Page│Astronomy Links│
... | 4 | [
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ratio of circle to triangle
December 14th 2010, 04:02 AM #1
ratio of circle to triangle
A triangle is formed inside a circle by connecting the center C to two
points A and B on the circle. If angle ACB = 30degrees, what is the ratio of the
areas of the circle to the triangle?
i want to find the area ... | 4 | [
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Word problem that looks so simple!
May 21st 2008, 01:23 PM
jesuslover
Word problem that looks so simple!
Hello!
Here is the word problem:
Three pails and 6 baskets contain 576 eggs. All the pails contain 1/3 as many eggs as all the baskets. How many eggs are there in each pail? In each basket?
I tri... | 4 | [
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Maximum Likelihood Estimator Problem
March 17th 2009, 09:50 PM #1
Newbie
Joined
Sep 2008
From
Tennessee
Posts
11
Maximum Likelihood Estimator Problem
The lifetime, Y, of a certain type of component is known to follow the Exponential distribution. So for a sample of n such components, we know that the... | 5 | [
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