content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Wave equations
May 4th 2011, 07:25 AM #1
Member
Joined
May 2008
Posts
87
Wave equations
First, please forgive the poor notation used here as LaTeX does not seem to be working properly for the time being (http://www.mathhelpforum.com/math-help/f47/working-latex-issues-178319-2.html)?
This is a proble... | 5 | [
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Superconducting Rectangular Microstrip Patches over Ground Planes with Rectangular Apertures in Substrates Containing Anisotropic Materials
International Journal of Antennas and Propagation
Volume 2013 (2013), Article ID 169893, 7 pages
http://dx.doi.org/10.1155/2013/169893
Research Article
Analysis of High Supercon... | 4 | [
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... | 27,701 | 27701 | |
Prove cyclic subroups => cyclic group
Prove (or disprove) If G is a group in which every proper subgroup is cyclic, then G is cyclic.
Think small! What groups do you know of order < 6?
Could an example of $S_3$ be used as proof? I'm not too comfortable with subgroups or cyclic groups yet, but from my understanding, t... | 5 | [
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Minimizing with Lagranges' Multipliers
September 18th 2007, 06:18 PM #1
Newbie
Joined
Sep 2007
Posts
2
Minimizing with Lagranges' Multipliers
So this is the exact problem:
An industrial container is in the shape of a cylinder with hemispherical ends. The container must hold 1000 liters of fluid. Det... | 4 | [
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Trig Identities Help
May 3rd 2009, 03:54 PM #1
Newbie
Joined
May 2009
Posts
4
Trig Identities Help
1. tan(x+(pi/2)) = -cotx
2. cos^2(x) = csc^2(x)-cot^2(x) / sec^2(x)
3. cosx + cosxtan^2(x) = secx
I'm just not good with this stuff. I tried expanding the left side of the first one using sum a... | 4 | [
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Proofs for right/left shift operators
October 14th 2010, 11:59 AM #1
Member
Joined
Jan 2010
Posts
232
Proofs for right/left shift operators
This one probably isn't that hard, though right now I'm having some trouble.
Suppose $V$ is a vector space over a field $F$.
Let $S^+:R^\infty\rightarrow R... | 5 | [
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Tangent Plane Problem
April 11th 2010, 10:48 PM #1
Newbie
Joined
Apr 2010
Posts
13
Tangent Plane Problem
I have got stuck on finding the equation for the tangent plane for the equation:
yz = ln(x + z), at point (0, 0, 1).
What I have done is rearrange to
[ ln(x + z) ]/yz = 1, then
Fx(... | 4 | [
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mathschallenge.net
Isosceles Trapezium
Problem
An isosceles trapezium ABCD is placed inside a semicircle such that they share the same base, AD = 4, and the lengths AB = DC = 1 are chords.
Find the length BC.
Solution
Consider the following diagram.
By applying the Pythagorean theorem to right-angle triangles on ... | 4 | [
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simple proof
February 17th 2008, 12:28 PM #1
Newbie
Joined
Feb 2008
Posts
6
simple proof
How would you prove this, I'm stuck. Thanks
Let A and B be sets. Then A union B = A if and only if B is subset of A.
First, you can see from the definition of a subset and from the definition of the union o... | 4 | [
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Design and Optimization of a Monoaxial Tracking System for Photovoltaic Modules
Journal of Solar Energy
Volume 2013 (2013), Article ID 586302, 6 pages
http://dx.doi.org/10.1155/2013/586302
Research Article
Design and Optimization of a Monoaxial Tracking System for Photovoltaic Modules
Transilvania University of Braş... | 4 | [
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Finding Limits Using L'Hopital's Rule
September 3rd 2012, 09:12 AM #1
Junior Member
Joined
Aug 2012
From
Texas
Posts
48
Finding Limits Using L'Hopital's Rule
Okay I'm trying to find this limit:
lim (ln(x))^1/x as x approaches infinity using L'Hopital's rule.
This is what I've done so far:... | 5 | [
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Mean-value theorem for integrals??!
May 6th 2007, 11:46 PM #1
Mean-value theorem for integrals??!
Mean-value theorem for integrals:
========================================
Suppose that f is continuous on [a,b],Then there is a number c on [a,b] such that
$\int_a^b f(x)dx=(b-a)f(c)$
============... | 5 | [
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hard fraction
November 12th 2010, 06:45 AM #16
Not quite. What did you do with the (2) and the (3) to get its LCM? That's what you have to do with the (2) and the (x+2) in this situation.
okay, would it be 2x+4?!?!?!?
There you go. I'd probably write it as 2(x+2) to emphasize how you got it. Now that you... | 4 | [
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I need help with this Algebraic Models problem
June 7th 2010, 03:12 PM #1
Newbie
Joined
Jun 2010
Posts
1
I need help with this Algebraic Models problem
A glass butterfly conservatory is a square-based pyramid. The height of the conservatory is one-half he side of the base. The volume is 900 m^3.
1. ... | 4 | [
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Mixed Variables-Attributes Test Plans for Single and Double
Mathematical Problems in Engineering
Volume 2011 (2011), Article ID 575036, 15 pages
http://dx.doi.org/10.1155/2011/575036
Research Article
Mixed Variables-Attributes Test Plans for Single and Double Acceptance Sampling under Exponential Distribution
School... | 5 | [
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Multiobjective Model for Emergency Resources Allocation
Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 538695, 6 pages
http://dx.doi.org/10.1155/2013/538695
Research Article
Multiobjective Model for Emergency Resources Allocation
^1College of Traffic, Jilin University, Changchun 130012, China
^2... | 4 | [
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Superheat formula for charging capilary systems [Archive] - Refrigeration-Engineer.com forums
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View Full Version : Supe... | 4 | [
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Math Help
September 25th 2009, 03:00 PM #1
MHF Contributor
Joined
May 2008
Posts
2,295
Thanks
7
Limit (6)
Suppose $f: [0,\infty) \longrightarrow \mathbb{R}$ is continuous and let $a_n=\int_0^1 f(x+n) \ dx, \ \ n \in \mathbb{N}.$ We know that $\lim_{n\to\infty} a_n=L.$ Evaluate $\lim_{n\to\infty} \
... | 5 | [
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inverse modulo
Find the inverse modulo m of each integer n below: a) n=8 and m=35 b) n=51 and m=99
Hello,Find p such that $8p=1 \bmod 35$ Euclidian division : $35=8 \times 4+3 \implies 3=35-8 \times 4$ $8=3 \times 3-1 \implies 1=3 \times 3-8=3 \times (35-8 \times 4)-8=3 \times 35-12 \times 8-8=3 \
times 35-13 \times 8... | 5 | [
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Linear Programming and systems, HELP ME! :(
October 11th 2012, 04:26 PM #1
Newbie
Joined
Oct 2012
From
Bronx
Posts
2
This problem is so hard. I can't figure it out!
"A gaming manufacturing company has developed a new gaming system. To produce the new system, they plan on using resources in two man... | 4 | [
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Proof involving GCD of numbers
April 10th 2008, 03:05 AM
p vs np
Proof involving GCD of numbers
I would like to know of the line of approach one needs to take in the following (and similar problems involving elementary concepts of GCD of numbers)problem.
The problem is-
For any 2 integers a,b, prove th... | 4 | [
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Correcting test
January 27th 2010, 03:48 PM #1
Newbie
Joined
Jan 2010
From
Toronto
Posts
4
Correcting test
Questions that I need help correcting.
1) In how many ways can a six member committee form a subcommittee with at least two members?
2) A new theme park will have five roller coasters,... | 4 | [
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help me in Prove
May 9th 2010, 06:58 AM #1
Newbie
Joined
Nov 2009
Posts
23
help me in Prove
Prove
1) $X$ is a regular space, $A$ compact set and $B$ closed set,
$A \bigcap B = {\O}$
Then there is open sets U and V exist, such that
$A\subseteq U, \ B \subseteq V,\ A \bigcap B = {\O}$
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Intermediate Algebra
July 14th 2008, 02:08 PM #1
Member
Joined
Apr 2008
Posts
78
Intermediate Algebra
Simplify the following radicals. Assume that the variables can represent a positive number.
square root of (4x)^2
Would that be 2x?
cubed square root of -125d^3
Would that be 5d^3
F... | 4 | [
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... | 27,723 | 27723 | |
Intersection of Lines problem
June 2nd 2008, 01:07 PM
helpmeinmath
Intersection of Lines problem
I am studying for an upcoming exam and i came across this question that many of my classmates didt get so heres the question
Part A
Find the point G at which the normal through the origin intersects the line... | 4 | [
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Isolated singularities (Complex Analysis)
October 9th 2008, 10:44 AM #1
Member
Joined
Mar 2008
Posts
99
Isolated singularities (Complex Analysis)
Locate each of the isolated singularities of the given function and tell whether it is a removable singularity, a pole, or an essential singularity. If the sin... | 5 | [
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App of derivatives... Max and min problem solving
October 25th 2006, 05:27 PM #1
Newbie
Joined
Sep 2006
Posts
24
App of derivatives... Max and min problem solving
Two sides of a Triangel have lengths of A and B, and the angle between them is Theta what value of Theta will maximixe the triagle's area? HIN... | 5 | [
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0.0546875,
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0.030029296875,
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0.055908203125,
0.07568359375,
0.01348876953125,
-0.0279541015625,
... | 27,726 | 27726 | |
Performance Prediction of a Synchronization Link for Distributed Aerospace Wireless Systems
The Scientific World Journal
Volume 2013 (2013), Article ID 159742, 8 pages
http://dx.doi.org/10.1155/2013/159742
Research Article
Performance Prediction of a Synchronization Link for Distributed Aerospace Wireless Systems
Sc... | 4 | [
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0.09375,
... | 27,727 | 27727 | |
Splitting Fields and Galois Groups
March 6th 2012, 08:43 AM #1
Junior Member
Joined
Jan 2010
Posts
29
Splitting Fields and Galois Groups
Hi,
I've been set a question and think I've managed about half of it but stuck on some other bits..
Show that $f := x^3 - 3x + 1$ is irreducible over $\mathbb... | 5 | [
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0.0172119140625,
-0.056884765625,
-0.02099609375,
0.004302978515625,
-0.087402... | 27,728 | 27728 | |
Calculus I Help?
Find the Riemman Sum of the integration of x^3 from 1 to 2.
Quote: Originally Posted by Nimmy It depends how you want to partion the region. I will partition the region with right-endpoint. Take interval $[1,2]$ divide it in $n$ equal regions. Thus, each one
has length $\Delta x=\frac{2-1}{n}=\frac{1}... | 5 | [
0.039794921875,
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0.034423828125,
0.029174... | 27,729 | 27729 | |
Prime and Factorable Polynomials
November 26th 2011, 01:11 PM
xivivx
Prime and Factorable Polynomials
I'm new to factoring. Don't really understand the definition of "prime". I did 47 questions in my homework, but I want to make sure if some are right or wrong.
I will answer the questions. Tell me if they a... | 4 | [
0.0361328125,
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0.0703125,
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-0.0172119140625... | 27,730 | 27730 | |
exact values practice question
March 12th 2009, 06:03 AM
jvignacio
exact values practice question
Suppose cos A = $-\frac{7}{25}$ and tan B = $\frac{15}{8}$
where A is in the second quadrant and B is in the third quadrant. Find the exact values of:
sin(A-B):
tan(A-B):
any help much app... | 4 | [
-0.045654296875,
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-0.028076171875,
0.061767578125,
0.059326171875,
0.029052734375,
0.024780273... | 27,731 | 27731 | |
Time Synchronization and Performance of BeiDou Satellite Clocks in Orbit
International Journal of Navigation and Observation
Volume 2013 (2013), Article ID 371450, 5 pages
http://dx.doi.org/10.1155/2013/371450
Research Article
Time Synchronization and Performance of BeiDou Satellite Clocks in Orbit
Beijing Satellite... | 4 | [
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0.0478515625,... | 27,732 | 27732 | |
A. A proof for Linear groups
Next: Bibliography Up: The Work of Efim Previous: 4 The Proof of
A. A proof for Linear groups
Let G be a finitely generated subgroup of the group of invertible n×n matrices over complex numbers. We give a proof for the Ordinary Burnside problem first.
Let R be the collection of com... | 4 | [
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Self-Propagating Reactive Fronts in Compacts of Multilayered Particles
Journal of Nanomaterials
Volume 2013 (2013), Article ID 198096, 11 pages
http://dx.doi.org/10.1155/2013/198096
Research Article
Self-Propagating Reactive Fronts in Compacts of Multilayered Particles
^1Department of Mechanical Engineering, Johns H... | 4 | [
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... | 27,734 | 27734 | |
Algebra problem.... me again
The problem is
2 + (1 / y + 1) - (1 / y - 1) = 0
Ok what I did was Mulitply the entire equation by the common denominator of
(y + 1)(y - 1).
I end up getting
2(y + 1)(y - 1) + y - 1 - y + 1 = 0
From here, I keep working the problem until it gets to
... | 4 | [
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Voltage Stability Bifurcation Analysis for AC/DC Systems with VSC-HVDC
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 387167, 9 pages
http://dx.doi.org/10.1155/2013/387167
Research Article
Voltage Stability Bifurcation Analysis for AC/DC Systems with VSC-HVDC
^1School of Electrical Engineering and Auto... | 4 | [
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0.03369140625... | 27,736 | 27736 | |
Patent US7408840 - System and method for disambiguating shooter locations
This application is a divisional application of U.S. patent application Ser. No. 10/925,875, filed Aug. 24, 2004, now U.S. Pat. No. 7,126,877 and is incorporated by reference herein.
GOVERNMENT CONTRACT
The U.S. Government has a paid-up license... | 4 | [
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Tricky question involving exact differentials
January 23rd 2011, 12:26 PM #1
Member
Joined
Jan 2010
Posts
232
Tricky question involving exact differentials
I've been asking around on this question for a bit, and though I have an answer for the first half of it, I'm a little bit iffy on the solidarity of ... | 5 | [
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-0.0... | 27,738 | 27738 | |
combining/simplifying logs (part 2)
October 6th 2009, 10:48 AM
Evan.Kimia
combining/simplifying logs (part 2)
http://img25.imageshack.us/img25/2971/log2vh.jpg
Here is the 2nd one which asks to simplify the whole thing as a logarithm. Again, not sure how to take the integers at the end and convert them into ... | 4 | [
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0.129882812... | 27,739 | 27739 | |
Plotting Complex Variables on Argand Diagrams
August 8th 2006, 06:38 AM #1
Junior Member
Joined
Aug 2006
Posts
36
Plotting Complex Variables on Argand Diagrams
Hello again guys,
I have the following problem:
Problem:
a) Plot the following complex variables on an Argand diagram
(i) 2 +... | 4 | [
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0.005645751953125,
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0.04833984375,
-0.006134033203125,
-0.084960... | 27,740 | 27740 | |
Finance word problem help
July 11th 2010, 02:22 PM #1
Newbie
Joined
Jul 2010
Posts
7
Finance word problem help
Can someone please tell me how i solve this ? thanx
A couple wants to buy a house and can afford to pay $1400 per month.
a) if they can get a loan for 30 years with the interest at 8%... | 4 | [
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Some Properties for Certain Class of Analytic Functions with Varying Arguments
International Journal of Analysis
Volume 2013 (2013), Article ID 380938, 4 pages
http://dx.doi.org/10.1155/2013/380938
Research Article
Some Properties for Certain Class of Analytic Functions with Varying Arguments
Department of Mathemati... | 5 | [
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how to factor this
January 19th 2014, 04:27 PM #1
how to factor this
0=2cos^2x + 2*sqrt2 * cos x + 1
When I tried the quadratic formula, the discriminant was equal to zero. So i know this can be factored, but i do not know how to deal with sqrt2.
Thank you for your time
Re: how to factor this
\dis... | 4 | [
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0.... | 27,743 | 27743 | |
Inverse Laplace Transform
November 6th 2009, 05:24 PM #1
Member
Joined
Oct 2009
Posts
82
Inverse Laplace Transform
Hi,
I need to find the inverse Laplace transform of
$F(s) = s^{-2} \tanh(sT/2)$.
I suspect I have to use the period definition for Laplace transforms but I can't see how to ma... | 5 | [
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0.01708984375,
-0.043701171... | 27,744 | 27744 | |
Starlikeness and Convexity of Generalized Struve Functions
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 954513, 6 pages
http://dx.doi.org/10.1155/2013/954513
Research Article
Starlikeness and Convexity of Generalized Struve Functions
^1Department of Mathematics, Faculty of Science and Art, Erzincan U... | 5 | [
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... | 27,745 | 27745 | |
Coordinate geometry
Three points have coordinates o(0,0), A(5,0) and B(7,6). If P is the point (x,y) where y>0, calculate the value of x and y given that AP=BP and that the area of the triangle AOP is 10sq. units.
Hello, Ilsa! Three points have coordinates: . $O(0,0),\: A(5,0),\:B(7,6)$ If $\,P(x,y)$ where $y>0$, calc... | 4 | [
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0.0203857421875,
0.047119140625,
0.07861328125,
-0.06982421875,
-0... | 27,746 | 27746 | |
simplyfy the following as much as possible
April 2nd 2009, 04:52 AM #1
Junior Member
Joined
Mar 2009
Posts
36
simplyfy the following as much as possible
the A and B's represent matrices
A(B + A^-1)((B^-1) A) i got A^2 +AB^-1
(A + B)(A^-1 + B^-1) i got 2I + AB^-1 + BA^-1
and [A^3(A^2)^-1]^-1... | 5 | [
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0.11328125,
-0.00970458984375,
0.066... | 27,747 | 27747 | |
A more elegant solution for proving these trig. identities?
May 3rd 2009, 07:55 AM
smmxwell
A more elegant solution for proving these trig. identities?
Hi there. I just learnt trigonometry today, and the teacher didn't really delve much into the topic yet, just the basic identities. I can prove these identities ... | 4 | [
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0.056152343... | 27,748 | 27748 | |
Group whose order is a power of a prime contains an element of order prime
February 16th 2011, 09:52 PM #1
Group whose order is a power of a prime contains an element of order prime
I don't know how to go about this. So the group has $p^{n}$ elements and I have to somehow use cosets or Langrage's theorem, but I r... | 5 | [
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0.01165771484375,
-0.0131225585... | 27,749 | 27749 | |
A Sturm-Liouville Problem with a Discontinuous Coefficient and Containing an Eigenparameter in the Boundary Condition
Physics Research International
Volume 2013 (2013), Article ID 159243, 9 pages
http://dx.doi.org/10.1155/2013/159243
Research Article
A Sturm-Liouville Problem with a Discontinuous Coefficient and Cont... | 5 | [
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0.0219726562... | 27,750 | 27750 | |
more help needed
December 3rd 2009, 05:30 PM #1
Newbie
Joined
Feb 2009
Posts
8
more help needed
find dy/dx of
y= ln(x^2 + 9)^4
i know you have to use the chain rule but i really need some help. i've got an exam tomorrow and i don't konw how to do this
Remember the properties of logarithms:... | 5 | [
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Humboldt Economic Index
Estimating Total County Employment for the Humboldt Economic Index:
Two Models by John Manning December 2, 2002 Revised March 31, 2003
Executive Summary
Employment is, arguably, the single most important indicator of economic activity. Thus, a timely and accurate estimation of the employment ... | 4 | [
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-0.05346679687... | 27,752 | 27752 | |
Coordinate geometry
May 2nd 2010, 10:41 PM #1
Super Member
Joined
Dec 2009
Posts
755
Coordinate geometry
Given a straight line BD where point E lies on it.
Coordinates $B(0.5,3)$ and $E(1,1)$
Find the coordinates of D given that $BE : ED = 1:3$ and the equation of the line BD is $y=-4x+5$
... | 4 | [
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0.036865234375,
-0.044189453125,
-0.0... | 27,753 | 27753 | |
implicit differentiation
Find $\frac{d^2y}{dx^2}$ by implicit differentiation: $2x^3-3y^2=8$
So far I get
$\frac{dy}{dx}=\frac{x^2}{y}$
$\frac{d^2y}{dx^2}=\frac{2y}{x}$ <----- incorrect
correct answer= $\frac{2xy^2-x^4}{y^3}$
How do i find the correct answer?
| 4 | [
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A Proposed Content-Uniformity Test for Large Sample Sizes - Pharmaceutical Technology
Applications of process analytical technology (PAT) for in-process and/or end-product release testing are attracting wide interest from both regulators and the pharmaceutical industry. Nondestructive
measurement techniques such as nea... | 4 | [
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Intergration Problem (Substitution I think)
January 10th 2010, 05:57 AM #1
Junior Member
Joined
Dec 2009
Posts
30
Intergration Problem (Substitution I think)
I have this integral i need to do in the middle of a engineering question and I have looked in a few directions at it and cant seem to crack it!
... | 5 | [
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0.018798828125,... | 27,756 | 27756 | |
Real Symmetric Matrix
December 30th 2009, 06:00 PM #1
Newbie
Joined
Dec 2009
From
toronto
Posts
17
Real Symmetric Matrix
Consider the following real symmetric matrix:
0 1 -1
1 0 1
-1 1 0
it has eigenvalues t1=-2,t2=1,t3=1
with corresponding eigenvectors:
v1=(1,-1,1)^T
v2=... | 5 | [
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Radical functions
October 9th 2012, 07:28 PM
EASYPEAAZY
Radical functions
hey everyone,
im not here to just get answers because im lazy, im here because i got a 10 page notebook and ive done 90 pct of the questions and just a few is left. This question really confuses me, i just
need help to solve it so ... | 4 | [
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... | 27,758 | 27758 | |
Free Vibration of Laminated Composite Hypar Shell Roofs with Cutouts
Advances in Acoustics and Vibration
Volume 2011 (2011), Article ID 403684, 13 pages
http://dx.doi.org/10.1155/2011/403684
Research Article
Free Vibration of Laminated Composite Hypar Shell Roofs with Cutouts
Department of Civil Engineering, Meghnad... | 4 | [
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The Limit Behavior of a Stochastic Logistic Model with Individual Time-Dependent Rates
Journal of Mathematics
Volume 2013 (2013), Article ID 502635, 7 pages
http://dx.doi.org/10.1155/2013/502635
Research Article
The Limit Behavior of a Stochastic Logistic Model with Individual Time-Dependent Rates
^1Institute for Cy... | 4 | [
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-0.031982421875... | 27,760 | 27760 | |
Relativistic Propagation of Linearly/Circularly Polarized Laser Radiation in Plasmas
ISRN Optics
Volume 2013 (2013), Article ID 642617, 8 pages
http://dx.doi.org/10.1155/2013/642617
Research Article
Relativistic Propagation of Linearly/Circularly Polarized Laser Radiation in Plasmas
^1Department of Engineering Physi... | 4 | [
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... | 27,761 | 27761 | |
subgroup question with direct product
April 5th 2010, 10:40 AM #1
Junior Member
Joined
Apr 2010
Posts
43
subgroup question with direct product
Let G = Z+Z10 (+ is direct sum) and let H = { g an element of G | |g|=∞ or |g|=1 }. Prove or disprove that H is a subgroup of G. [Subgroups that contain no elemen... | 5 | [
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the encyclopedic entry of Banach, Stefan
Banach's match problem
is a classic problem in
probability
attributed to
Stefan Banach
.
Suppose a mathematician carries two matchboxes at all times: one in his left pocket and one in his right. Each time he needs a match, he is equally likely to take it from either pocket... | 5 | [
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... | 27,763 | 27763 | |
C
An imprecise probability law is a generalization of probability in which events may have upper and lower probabilities that are not equal. Such a construction may be a more realistic
representation of prior ignorance then the (precise) prior distribution of Bayesian inference. Bayes' rule can be applied to im... | 4 | [
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the encyclopedic entry of consonantal all iteration
In mathematics, Lyapunov fractals (also known as Markus-Lyapunov fractals) are bifurcational fractals derived from an extension of the logistic map in which the degree of the growth of the
population, r, periodically switches between two values A and B.
A Lyapunov fr... | 4 | [
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Grade ten math
January 18th 2011, 03:31 PM #1
Member
Joined
Sep 2009
Posts
162
Grade ten math
Factor completely:
40x^5y^2 - 32x^7y^6 + 28x^8y^4 - 36x^7y^5
I thought factor completely meant solve for the unknown variable. However, I have no idea what the answer is for this question. I know the gr... | 4 | [
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Math problem
April 17th 2008, 02:33 PM #1
Junior Member
Joined
Mar 2008
Posts
41
Math problem
We have alternating current in the United Sates. This electric current alternates with a frequency of 60 cycles per second. Suppose that at time of t = 0.02 seconds, the current is at its maximum
of l = 5 am... | 4 | [
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change of coordinates
April 12th 2010, 02:07 AM #1
Newbie
Joined
Feb 2010
Posts
8
change of coordinates
i tried to use Latex but i failed so here's the problem the double integral of (x^2 + y^2) ^1/2 dx dy the inner limit is from 0 to (3y-y^2)^1/2 and the outer limit is from 0 to 3
i know how to cha... | 5 | [
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Help, it's hard! :-S
December 8th 2009, 11:27 AM #1
Newbie
Joined
Dec 2009
Posts
7
Help, it's hard! :-S
In the ring Q[x], consider the polynomials:
f(x) = x^5 + 2x^3 + x^2 + x + 1 and g(x) = x^4 + x^3 + x -1
a) Find the greatest common divisor d(x) of f(x) and g(x).
b) Find h(x), k(x) eleme... | 5 | [
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0.083984375,
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0.016845703125,
-0.027099609375,
0... | 27,769 | 27769 | |
Smolyak-Grid-Based Flutter Analysis with the Stochastic Aerodynamic Uncertainty
Discrete Dynamics in Nature and Society
Volume 2014 (2014), Article ID 174927, 8 pages
http://dx.doi.org/10.1155/2014/174927
Research Article
Smolyak-Grid-Based Flutter Analysis with the Stochastic Aerodynamic Uncertainty
School of Aeron... | 4 | [
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Tracking Control without Reaching Phase for Nonlinear System
Journal of Control Science and Engineering
Volume 2013 (2013), Article ID 498461, 7 pages
http://dx.doi.org/10.1155/2013/498461
Research Article
Optimal Robust Adaptive Fuzzy Tracking Control without Reaching Phase for Nonlinear System
LESSI Laboratory, D... | 4 | [
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0.08935546875,
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trigonometry Addition Formulae (ii)
January 4th 2007, 03:00 PM #1
Member
Joined
Jan 2007
Posts
162
trigonometry Addition Formulae (ii)
As you may see, I am struggling at this.
Show that, for triangle RST, t = r sin (alpha + beta) / sin alpha
iv tried using the sine rule,
t / sin(180 - a... | 4 | [
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[SOLVED] Year 8 maths. quick
June 27th 2008, 03:33 AM #1
Banned
Joined
Jun 2008
Posts
4
Hi i know this may seem easy but it is confusing. please help!!
Both the leftmost digit and the rightmost digit of a four-digit number N are equal to 1. When these digits are removed, the two-digit numbers thus ob... | 4 | [
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0.03564453... | 27,773 | 27773 | |
A Two-Wheeled Self-Balancing Robot with the Fuzzy PD Control Method
Mathematical Problems in Engineering
Volume 2012 (2012), Article ID 469491, 13 pages
http://dx.doi.org/10.1155/2012/469491
Research Article
A Two-Wheeled Self-Balancing Robot with the Fuzzy PD Control Method
^1College of Automation, Harbin Universit... | 4 | [
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... | 27,774 | 27774 | |
First Order Linear Diff. Eqn?
May 20th 2008, 09:12 PM #1
Junior Member
Joined
May 2008
Posts
50
First Order Linear Diff. Eqn?
Hi all,
I am unsure of what to do with this one.
I have been given some conditions in an electric circuit. Due to Kirchoff's law I have calculated the differential equat... | 5 | [
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0.047607421875,... | 27,775 | 27775 | |
Integration with Trig
March 16th 2010, 04:40 PM #1
Junior Member
Joined
Feb 2010
Posts
43
Integration with Trig
Hi,
If you look on the attachment, I cannot understand how to get from the top equation to the second one. I mean, how does 3sin^2(x).cos(x) become just sin^3(x) ???
Is it something t... | 5 | [
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0.02978515625,
-0.04345703125,
-0.007537841796875,
0.0... | 27,776 | 27776 | |
Synchronization of Unified Chaotic Systems Using Sliding Mode Controller
Mathematical Problems in Engineering
Volume 2012 (2012), Article ID 632712, 10 pages
http://dx.doi.org/10.1155/2012/632712
Research Article
Synchronization of Unified Chaotic Systems Using Sliding Mode Controller
^1Department of Electrical Engi... | 4 | [
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-0.01251220703125,
-0.000530242919921875,
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0.08154296875,
-0.0301513671875,
-0.019... | 27,777 | 27777 | |
Analytical Expressions Pertaining to the Concentration of Substrates and Product in Phenol-Polyphenol Oxidase System Immobilized in Laponite Hydrogels: A Reciprocal Competitive Inhibition Process
Advances in Physical Chemistry
Volume 2012 (2012), Article ID 212818, 11 pages
http://dx.doi.org/10.1155/2012/212818
Resear... | 5 | [
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0.041015625,
0.05029296875,
-0... | 27,778 | 27778 | |
Dynamics and Control of High-Rise Buildings under Multidirectional Wind Loads
Smart Materials Research
Volume 2011 (2011), Article ID 549621, 15 pages
http://dx.doi.org/10.1155/2011/549621
Research Article
Dynamics and Control of High-Rise Buildings under Multidirectional Wind Loads
^1Department of Mechanical Engine... | 4 | [
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... | 27,779 | 27779 | |
-Difference Equations with Nonlocal Integral Boundary Conditions
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 410505, 8 pages
http://dx.doi.org/10.1155/2013/410505
Research Article
A Study of Nonlinear Fractional -Difference Equations with Nonlocal Integral Boundary Conditions
Department of Mathemati... | 5 | [
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... | 27,780 | 27780 | |
Euler problems/11 to 20
From HaskellWiki
< Euler problems
(Difference between revisions)
Lisp (Talk | contribs) (→Problem 14: fourth solution does not memoize)
← Older edit
... | 5 | [
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-0.03198242... | 27,781 | 27781 | |
Math Help
November 1st 2009, 11:40 AM #1
Member
Joined
Apr 2009
Posts
190
Graph
I need hints on the following questions:
1. Sketch the curve (y2-2)2+(x2-2)2=2. What does it look like?
I got 4 circles which kind of merge together where they meet.
2. kx^4=x^3-x Find the real roots when k=... | 4 | [
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Implicit Differentiation
September 29th 2012, 06:25 AM #1
Newbie
Joined
Aug 2012
From
Manila, Philippines
Posts
24
Thanks
1
Implicit Differentiation
I've tried differentiating this over again, and took me a while to get it. but Im not sure, my answer were (1/3, 4/3)
heres the question
At... | 5 | [
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[SOLVED] some matrices help
March 6th 2010, 06:48 AM #1
Junior Member
Joined
May 2009
Posts
28
[SOLVED] some matrices help
hi, some more matrices problems that i can't solve
no 1 :
a) Find PQ which i did =
i can't solve b which is
b) Find a matrix X such that PX + Q = P
no2) If... | 5 | [
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0.00631713867... | 27,784 | 27784 | |
Controller Design for a Class of Uncertain Lipschitz Nonlinear Systems with Time-Delays
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 265473, 9 pages
http://dx.doi.org/10.1155/2013/265473
Research Article
Nonfragile Robust Finite-Time - Controller Design for a Class of Uncertain Lipschitz Nonlinear Sy... | 4 | [
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0.109375,
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0.054931640625,
0.0020904541015625,
-... | 27,785 | 27785 | |
Planar Intersections-Please help
May 15th 2010, 04:04 PM #1
Junior Member
Joined
May 2010
Posts
36
Planar Intersections-Please help
Find the equation of the plane that passes through the line of intersection of the planes x - 3y - 2z - 1 = 0 and 2x + 4y + z - 5 = 0 and parallel to the x-axis.
Find ... | 4 | [
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Distributed Consensus for Discrete-Time Directed Networks of Multiagents with Time-Delays and Random Communication Links
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 158731, 9 pages
http://dx.doi.org/10.1155/2013/158731
Research Article
Distributed Consensus for Discrete-Time Directed Networks of Mult... | 4 | [
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0.022705078125,
-0.044... | 27,787 | 27787 | |
A Method for Simulating Burr Type III and Type XII Distributions through
ISRN Applied Mathematics
Volume 2013 (2013), Article ID 191604, 14 pages
http://dx.doi.org/10.1155/2013/191604
Research Article
A Method for Simulating Burr Type III and Type XII Distributions through -Moments and -Correlations
^1Department of... | 4 | [
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If the order of a group is prime number then the group is cyclic?
February 3rd 2013, 11:21 AM #1
If the order of a group is prime number then the group is cyclic?
Let $G$ be a group with a prime number $p$ of elements. If $a \in G$ where $a eq e$,
then the order of $a$ is some integer $m eq 1$.
But then ... | 5 | [
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Stable Newton-Cotes Formulas
The purpose of this page is to propose numerical integration formulas for uniformly spaced data which are numerically stable even for high orders of approximation.
We consider widely used Newton-Cotes formulas from the perspective of digital filter analysis exploring their infamous instabi... | 4 | [
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Coordinate geometry
April 1st 2008, 06:38 AM
Coach
Coordinate geometry
Dear forum members,
I have a following problem
A circle touches both the x-axis and the y-axis and passes through the point (1,2). Find the equation of the circle. How many possibilities are there?
My solution
If the... | 4 | [
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0.002532958... | 27,791 | 27791 | |
A Note on the Observability of Temporal Boolean Control Network
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 631639, 9 pages
http://dx.doi.org/10.1155/2013/631639
Research Article
A Note on the Observability of Temporal Boolean Control Network
^1College of Mathematics, Physics and Information Enginee... | 4 | [
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Effects of Time-Varying Impulses on the Synchronization of Delayed Dynamical Networks
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 212753, 10 pages
http://dx.doi.org/10.1155/2013/212753
Research Article
Effects of Time-Varying Impulses on the Synchronization of Delayed Dynamical Networks
^1Faculty of... | 5 | [
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polynomial adding!
February 21st 2008, 07:16 PM
wildstyle1
polynomial adding!
i have a test to assess my skills tommorrow and i need to know how to add polynomials..
could someone walk me through this question and how to come up with an answer...
its question 5 of this link (dont worry, the link leads ... | 4 | [
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... | 27,794 | 27794 | |
Math Help
May 8th 2009, 03:07 PM #1
Congruence
hi
I would be grateful if someone could walk me through how exactly to calculate $3^{40}\, (mod 7)$
I know that I can take $3^{40}\, (mod 7) \equiv (3\, (mod 7))^{40}$
How do I proceed?
Since 7 is prime we can use fermat little theorem
ie
... | 4 | [
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... | 27,795 | 27795 | |
Algebra and Trig
Posted by April on Thursday, March 10, 2011 at 1:16pm.
Aldo has feet of fencing. He will use it to form three sides of a rectangular garden. The fourth side will be along a house and will not need fencing. What is the maximum area that the garden can
have?
• Algebra and Trig - Reiny, Thursday, Marc... | 5 | [
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m06 Q 37
Question Stats:
0%0% (00:00)based on 0 sessions
suhasrao wrote:
There are 6 points on the plain. Any 3 points of these 6 don't lie on the same line. How many unique triangles can be drawn using these 6 points as vertices?
5
10
20
30
60
Why isn't the answer 60. We can choose 1 vertice and there are 5C2 = 1... | 4 | [
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Sequences (F#)
A sequence is a logical series of elements all of one type. Sequences are particularly useful when you have a large, ordered collection of data but do not necessarily expect to use all the elements.
Individual sequence elements are computed only as required, so a sequence can provide better performance ... | 5 | [
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solving the equation
Hi there, it would be much appreciated if any one can help me solve this equation 2tan^2x+2sec^2x-secx =12 thanks
$\frac{2\sin^2x}{\cos^2x}+\frac{2}{\cos^2x}-\frac{1}{\cos x}=12\Rightarrow 12\cos^2x+\cos x-2\sin^2x-2=0$ Replace $\sin^2x=1-\cos^2x$, then note $\cos x=t$ and solve the quadratic. Can... | 4 | [
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