
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:24 AM
micromass

1 
46,552 
I am trying to calculate the following sum:
...

Apr1812 09:36 PM
DonAntonio

1 
1,047 
I have a quantity U(x), x>0, which I cannot calculate exactly. Numerically, I can calculate an approximation...

Apr1812 05:10 PM
bruno67

0 
749 
Dear All,
When I have a equation 1/sT
its an integrator with time constant
i.e Assuming a T of 5s, if I input a...

Apr1812 04:56 PM
RadKrish

0 
867 
\Sigma_{n=1}^∞\frac{\sqrt{n}}{n!}
I know it converges, because it is must be between e and e1
Thanks!

Apr1812 04:23 PM
collinback

0 
802 
I am trying desperately to figure out a Fourier series question i have been given and have hit a big mental wall can...

Apr1812 03:09 PM
LCKurtz

8 
1,492 
Hi
I am doing integration and cannot see how when you integrate
x*
you get
/ 3n

Apr1812 12:39 PM
izzy93

1 
1,247 
Hello! I'm want to prove a vector identity for
(\nabla \times \vec{A}) \times \vec A
using the familiar method...

Apr1812 09:15 AM
center o bass

0 
742 
What will the xint be in this equation? (x^2 +1)/ (x^2 4)

Apr1812 09:01 AM
lugita15

5 
980 
For a function such as
w=5xy/z
How would you find the partial derivative of w with respect to y or z? I've...

Apr1812 08:46 AM
SwaGGeReR

6 
1,664 
1. In the Khan academy video I watched on partial derivatives, I understand absolutely everything except for the last...

Apr1812 04:22 AM
Dorslek

2 
806 
How do I go about determining where f(x,y) = \sqrt{x + y} is differentiable?

Apr1812 12:32 AM
slider142

1 
751 
I have a large class of fourier transform integrals that I would like to solve, approximate, or just get some insight...

Apr1712 09:00 PM
laurent711

3 
797 
Please derive the righthand side from the left. If anyone could shed some light on this I would be grateful.
...

Apr1712 04:01 PM
ehrenfestcq

2 
806 
Hello. I had always been annoyed when dealing with parametric equations but it finally dawned on me how awesome the...

Apr1612 08:56 PM
victor.raum

1 
1,214 
Noting that we can get the Laplace transform of frequency differentiation L{tnf(t)}=(1)nF(n)(s).
If n is not an...

Apr1612 06:43 PM
cbzeng

0 
1,595 
I tried to find the length of a sine curve using calculus.I got stuck in the integral of integral(sqrt(cos(x)^2+1), x,...

Apr1612 07:20 AM
1994Bhaskar

4 
2,246 
So kind of like this thread, I'm looking to convert a discrete sum to an integral. My idea thus far has been to arrive...

Apr1512 04:21 PM
mathman

10 
2,719 
Hi, I was wondering about how to determine the residue of a pole that is written in the form:
f(z) = \frac{1}{(1 +...

Apr1512 06:21 AM
jackmell

3 
957 
I'm confused regarding the limits required for the following question:
Find the area in the plane between the...

Apr1512 05:01 AM
DonAntonio

3 
1,148 
Could somone tell me how is it that the double integral could be used for both calculating the area as well as the...

Apr1412 07:26 PM
HallsofIvy

2 
860 
Does anyone have any tips for solving the system of equations formed while trying to find Lagrange Multipliers? I have...

Apr1412 01:39 PM
HallsofIvy

1 
1,167 
The first fundamental theorem of calculus begins by defining a function like this:
http://i.imgur.com/aWXql.png
...

Apr1412 09:38 AM
sachav

7 
1,726 
Hi,
I need help with this problem;
minimize x^3, subject to K= xΩπ
so would the solution be
KΩπ=x

Apr1412 07:58 AM
HallsofIvy

1 
1,007 
I am looking for an explanation and derivation of a total differential of a 2nd order function, i.e. a function that...

Apr1312 02:24 PM
birulami

0 
743 
Say we want to find ∫(cosx)sinx dx
set u = cosx
so du/dx = sinx
∫u \frac{du}{dx}dx
And then the dx's...

Apr1312 01:16 PM
micromass

31 
3,492 
I came accross the question
The following equation represents two straight lines. Determine the equation of each of...

Apr1312 08:39 AM
HallsofIvy

1 
1,153 
The first order KKT condition for constrained optimization requires that the gradient for the Lagrangian is equal to...

Apr1212 02:56 PM
brydustin

4 
1,015 
I am reading a recent (2003) paper, "Fatou and Julia Sets of Quadratic Polynomials" by Jerelyn T. Watanabe. A...

Apr1212 01:27 PM
Unit

4 
1,149 
How do I find the local minimum of z=sqrt(x^2+y^2)
I know its simple, but I'm stuck on it. I've tried using the...

Apr1112 07:12 AM
AlephZero

3 
1,125 
\int^{\infty}_{1}\frac{1}{e^{t}1}dt
= ln(e  1) + 1
Not sure how to get the +1 part from infinity, seems like...

Apr1012 08:49 PM
scurty

3 
1,115 
Please see the attachment. Under the given range of parameters the integral converges, but I can't find a closed form...

Apr1012 07:31 PM
semigroups

2 
1,058 
Hi,
I have a probability density function defined by
1 / D x E . eABC/2
D is a single number
E is a...

Apr1012 05:47 PM
mathman

1 
781 
Hi folks,
I need to evaluate (numerically) a multidimensional integral of the form
\int_A f(x) dx.
Now in my...

Apr1012 08:51 AM
Derivator

12 
2,669 
greetings . any ideas on how to evaluate this integral
\lim_{T\rightarrow...

Apr912 02:29 AM
JJacquelin

4 
1,265 
Hi,
I am wondering how to express the domain of a twovariable function f(x,y) as below.
For any given y, f(x,y)...

Apr812 09:22 PM
loveinla

2 
1,018 
Alright. I completely confused about determining the area between regions of polar curves. However, I do feel that I...

Apr812 08:34 PM
chiro

3 
2,072 
Is there a general inversion formula or procedure for an integral of the form (where f is the function being...

Apr812 07:10 PM
KarmonEuloid

0 
1,550 
Can someone determine what this iteration works out to, where x' becomes x again each time, starting with x=1 and a...

Apr812 01:35 PM
HallsofIvy

8 
1,035 
I need a quick reminder that this is (hopefully) true:
Let \sum a_n be an infinite series of complex terms which...

Apr812 01:26 PM
Poopsilon

2 
1,156 
Hello!
I tried to develop equations of motion of system of wheels, where the first one with radius of r is rotated...

Apr812 08:31 AM
dodo

1 
684 