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

Feb2313 09:24 AM
micromass

1 
46,226 
It seems that the only applicable use I've seen is in finding intercepts on various axes. Are there any other...

Jun214 05:13 PM
Matterwave

5 
353 
Can anybody help in in finding the Fourier transform of f(x) = xe^x where 1<x<0 and f(x)= 0 otherwise?

Jun114 09:10 PM
Matterwave

5 
361 
I've made mistakes where scaling was used but I just assumed that I didn't need it. e.g. a bug walking towards <1,1,1>...

Jun114 07:29 PM
mill

10 
321 
I learned in my calc 1 class that to calculate the arc length of a curve, we are to compute the integral of the...

Jun114 04:13 PM
Frank89RM

8 
474 
I am quite confused between displacement and distance .
Suppose a particle travels along a semi circular path or...

Jun114 12:49 PM
Matterwave

1 
304 
If the critical points corresponding to the global min/max of a function ##f:\mathbb{R}^2\rightarrow\mathbb{R}## lie...

May3114 08:06 AM
HallsofIvy

1 
452 
If the tangent is horizontal, it is where the tangent is zero. In single var. calc. that would be at max. or min. for...

May3114 06:03 AM
SteamKing

3 
304 
∫sin(x^3) dx
I have absolutely no clue on what to deal with the x^3 part.
All I can think of is this:
∫sin(ax) dx...

May3014 11:39 PM
athosanian

9 
561 
I know its easier to use the substitution method, by I'm trying to see how it'll work for integration by parts. I...

May3014 11:25 PM
athosanian

3 
358 
\int_{0}^{a}\frac{x}{(x^2+z^2)^\frac{3}{2}}dx
Hi all, I'm stuck on this one. Sure theres an easier way to do it....

May3014 07:21 PM
klawlor419

6 
312 
http://sumo.stanford.edu/pdfs/smt2013/calculusproblems.pdf
NOTE: this is not homework problems. I am trying to...

May2914 04:55 PM
micromass

1 
391 
I would like to know whether there exists a solution to the following integral,
\frac{1}{\pi}...

May2914 03:17 PM
mathman

1 
312 
So I am pretty bad at u substitution.
I don't really get how to replace values with du or u.
Can you please give...

May2914 06:51 AM
HallsofIvy

7 
514 
Please, hurry. It's driving me nuts

May2814 11:02 PM
Nick O

2 
394 
in this video , the prof had to integrate x/(a^2+x^2)^3/2 , i know we usually do this using substitution , but in the...

May2814 06:07 AM
HallsofIvy

9 
394 
So I was reviewing my random process notes. In it there is an integral that they have that I can't seem to get the...

May2714 01:33 PM
quantumlight

2 
397 
This is not a homework question but something that has come up during work and I just need some guidance on what is...

May2714 09:42 AM
pamparana

0 
317 
Hi guys,
I am confused from what I know the max. value of directional derivative at a point is the length of the...

May2714 07:22 AM
HallsofIvy

2 
366 
Hi,
http://i.imgur.com/BhEN5Ms.jpg
The two terms should vanish at infinity according to the Quantum textbook of...

May2614 01:58 PM
DrClaude

7 
489 
I have a function:
f(x) = Asin2(x) + Bcos2(x) + Csin(2x)
and I want to find the minimum turning point(s). To...

May2614 03:17 AM
pasmith

4 
394 
A point has no dimension and a line, which has dimension, is made from points together. How does something without...

May2514 06:28 AM
Simon Bridge

3 
303 
Hi,
I'm stumbled on the following integral,
\int d\vec{q} e^{i\vec{q}\vec{r}} \cos(2\theta),
where \theta...

May2414 11:49 PM
amind

5 
525 
If the discrete summation is symbolized by ##\sum## and the continous by ##\int##, so, by analogoy, the discrete...

May2314 09:24 PM
Simon Bridge

1 
401 
I've come across a question which as really stumped me because I thought I knew how to do this but apparently not.
...

May2314 09:11 PM
Simon Bridge

1 
347 
Hi
Ive got some calculations to do on amount of charge on a capacitor with respect to t.
Formula for amount of...

May2314 03:03 PM
Matterwave

3 
356 
Hi,
My text book is giving me 3 rules that must be met to be continuous:
I don't understand what my text book is...

May2214 12:09 PM
gopher_p

4 
425 
hey pf!
suppose i have a function ##f( x , y)##. i make a change of variables such that ##z(x,y)## in such a way...

May2114 05:36 PM
joshmccraney

3 
442 
I would like to know how do we solve d2x/dt2 = k' where k' is a constant i.e the task is to find x as a function of...

May2014 04:45 PM
sudhirking

4 
568 
I'm quite interested in the history behind vector analysis especially Curl and Divergence and gradient operators etc....

May2014 03:58 PM
D H

6 
586 
I have a polar arc length problem that comes down to integrating √(sinθ + 1). Through double usub and trig sub I got...

May1914 11:07 PM
PranavArora

3 
516 
I usually see that Laplace transform is used a lot in circuit analysis. I am wondering why can we know for sure that...

May1914 12:28 PM
SteamKing

8 
451 
Is this possible..
Say, a∫b f(x)dx = G(x)x=b  G(x)x=a = S, where S, a and b are known. Can we find G(x) ?

May1914 12:13 PM
SteamKing

3 
736 
Am trying to get a solution to the definite integral below. Looking for some direction.
I = 0∫1 xf(x)dx where
...

May1914 06:48 AM
jam_27

9 
773 
When you have a fraction, how do you know when to use iteration by parts, or use substituion, pick a u, solve for a...

May1914 02:04 AM
sudhirking

5 
478 
Given V=xf(u) and u = \frac{y}{x} How do you show that:
x^2 \frac{\partial^2V}{\partial x^2} +...

May1814 03:17 PM
Chestermiller

6 
431 
I've seen it written two different ways:
$$\frac{\partial f}{\partial x} = \lim\limits_{h \rightarrow 0} \frac{f(x...

May1814 01:15 AM
Simon Bridge

1 
327 
Hi,
this is not a homework and my problem is much bigger for me to give full details here. I came across this...

May1714 04:42 AM
matteo86bo

4 
394 
I guess I have several definitions of df flying at me, and I am having trouble getting a continuous definition. So in...

May1614 07:55 PM
saminator910

3 
664 
For example the surface (x,y,x²+y²), can for example surfaces be considered as one abstract 'vector' in some abstract...

May1514 01:55 PM
JanEnClaesen

2 
335 
Hi there!
How can I prove that the space of matrices (2x2) nonzero determinant is dense in the space of matrices...

May1414 09:46 AM
brunob

7 
442 