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

Feb2313 09:24 AM
micromass

1 
45,358 
So I have a function which represents motion. This function is x^2 which is also the area of a square. Now, what I...

May1713 07:33 PM
jasonlr82794

17 
1,029 
I'm thinking in particular about Lenny Susskind's lectures, but I've seen other lecturers do it too. They'll be...

May1013 05:24 AM
jedishrfu

1 
671 
I dont get it guys. 100% on all the quizes and homework. 42% on the final.... Deptartment policy is that you have to...

May1213 09:21 PM
Simon Bridge

13 
1,049 
Hey guys. So, I'm in an Analysis class and we're at the section on Riemann integrals. I get the theory and the...

May1213 11:45 AM
Tim67

0 
621 
I have an oil spill that spills out at a rate of 100 ft per second. I need to find the rate of change of the radius at...

May1613 12:09 AM
Mark44

1 
461 
So I know that the derivative of the area of a circle is 2∏r or the circumference, and that the derivative of the area...

May1613 05:47 AM
arildno

10 
843 
Hey guys, I know what polynomials are but what I really don't understand is the way you are able to find the equation...

May1713 09:17 PM
Mark44

9 
683 
If we take the variation of a functional of some function \phi(x_1,...,x_n) with \partial_{j}\phi being the partial...

May1513 10:53 AM
pellman

1 
591 
I am trying to solve a function using Solve in mathmatica.
I am solving for multiple constants.
Can i use a solve...

May1313 01:52 PM
Bill Simpson

7 
880 
eg. Find the directional derivative of the function phi=xyz^2 at the point (1,2,3).
Actually what is the math used...

May1513 11:34 PM
Outrageous

6 
1,187 
I've come across this funny problem while messing around with integration by parts. Probably made a mistake somewhere....

May1513 03:02 PM
tade

1 
491 
Dyadic Cube C_{k,N} = X \in\ \mathbb{R}^{n} \frac{k_{i}}{2^{N}} \leq x_{i} < \frac{k_{i}+1}{2^{N}} for 1 \leq i \leq...

May1513 08:00 PM
Astrum

2 
584 
For arbitrary positive numbers ##\epsilon## and ##\delta## we know that ##0<\delta<\epsilon## such that...

May1813 03:08 PM
amirmath

4 
499 
Assume n\in\mathbb{N} and r\in\mathbb{R} are some fixed constants and r>0. I want to find some nice lower bound for...

May1413 12:27 PM
jostpuur

0 
466 
Hi,
If we have f(x) is logconcave in x, can we show that the following inequality is true? Or can we find some...

May1413 11:28 AM
loveinla

0 
405 
I have asked a similar question but it wasn't answered fully so here it goes. Why is it that you only need two points...

May1713 08:06 PM
Mark44

1 
500 
Is
f(x)=\sin\;\hbox{ and }\; g(x)=\sin
Both EVEN function?
It looks even function to me even though it's a...

May1113 11:37 AM
yungman

3 
499 
I've looked examples up online and I just can't figure out what to do exactly when I have (2x^2)/(x^2+1), for some...

May1313 09:11 PM
questionasker1

2 
501 
Hi, a naive question here, but I was wondering if the series
\sum^{∞}_{k=0} k a^{k}
has a particular name? As in...

May1113 02:06 AM
zeroseven

2 
545 
Hello,
Given is the function
f = f(a,b,t), where a=a(b) and b = b(t). Need to express first and second order...

May1313 08:58 AM
Sunfire

2 
640 
Hi,
I'm reading an article that has a sentence saying "where P is a function of period unity.".
Here.
I've...

May1513 02:11 PM
Alesak

2 
490 
Hello all,
I am reteaching myself calculus (I don't remember anything from Calculus in college, and I only took...

May1613 10:15 PM
DrewD

14 
923 
I am trying to make an mathmatical equation which can calculate the length of the wire, which is wounded around a a...

May1313 12:21 AM
215

2 
381 
Hi guys I am trying to come up with an equation to solve for a break even point. Basically I have an initial outlay of...

May1213 08:28 PM
Sagelm

0 
350 
Let's start with:
$$ \int \frac{dx}{1+x^2} = \arctan x + C $$
This is achieved with a basic trig substitution....

May1213 08:53 PM
piercebeatz

6 
687 
My question is relatively breif: is it true that
\displaystyle \lim_{n \rightarrow \infty}(\varphi(n))=\lim_{n...

May413 06:04 PM
henpen

4 
994 
And what is the justification to consider or not to consider dy=dx?
An Engineer, Weak in Calculus

May713 12:38 PM
gikiian

7 
1,212 
I was reading a paper the other day that made the following claim, and provided no reference for the assertion. I...

May513 08:00 PM
Mute

3 
755 
I'm having trouble understanding this.
Suppose I have a sum ##\displaystyle \sum_{i=1}^{n}\left##, where f(t)...

May413 04:32 PM
micromass

2 
483 
I was wondering how you prove that ∫(e^iax)(e^ibx)dx from minus infinity to infinity is zero. When I try to evaluate...

May413 12:51 PM
SammyS

2 
1,409 
I have this equation 1/(r^2+l^2)^(3/2) and I need to integrate it quickly. My first thought is using this integral...

May1313 02:01 AM
Simon Bridge

7 
529 
Hi,
So f(x,y) = xex(y2  4y)
Find all stationary points and classify them i got
for fx(x,y) s.p (1,4),(1,0)...

May1013 05:19 PM
JoshMaths

2 
592 
Minimizing a functional:
When you know the values of the function y(x) on the boundary points y(x1) and y(x2),...

May713 07:59 AM
Gux

5 
739 
I'm testing an algorithm to find the global mimina of a function. Can someone give me a few examples of optimization...

May913 07:37 PM
lugita15

1 
627 
1. The problem statement, all variables and given/known data
Well, this thread is purposely to clarify my question...

May913 12:34 PM
HallsofIvy

3 
951 
If I have ln(e^(8.336/10c)) wouldn't that be the same as ln(e^(1/(8.336/10c))) therefore = 1/(8.336/10c) = 10c/8.336?...

May913 10:31 AM
SteamKing

3 
527 
I'm noticing wolfram alpha has the amazing ability to analytically solve
\sum_{n=1}^{\infty} \frac{1}{n^2 + a^2}
...

May913 09:27 AM
dextercioby

6 
729 
How can I get the improper integral
## \int_0^{\infty}\frac{1}{x(1+x^2)}\,dx ##
First thing I tried was...

May913 02:45 PM
mathman

4 
604 
Newton and Leibniz both had a method of differentiating. Newton had fluxions and Leibniz had something that resembles...

May913 07:40 PM
lugita15

4 
728 
Hi
I am currently working on a project, and I need to calculate the definite triple integral of 1/x+y+z. i.e:
...

May913 02:49 PM
NamDogg

4 
644 