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

Feb2313 09:24 AM
micromass

1 
46,272 
How can I show that
1+\frac{n}{1!}+\frac{n(n1)}{2!}+\frac{n(n1)(n2)}{3!}+...= 2^{n}
This comes from proving...

Aug907 10:36 PM
theperthvan

2 
1,396 
3 + 2 log (base 2) X = log (base 2) y
how can this show, that y = 8X squared??? Please help! :confused:

Feb505 09:55 AM
arildno

4 
1,404 
I'd like to delete it.

Apr2004 02:41 PM
dapet

0 
2,607 
For a kinematic problem I obtained the following equations:
p1= r*sin(theta_c)  d*cos(psi_a)*sin(theta_a)+c1...

Feb2311 02:49 PM
azizz

2 
885 
(1) \alpha(tt_{0})=\int_{R_{0}}^{R(\Theta)}\frac{du}{u\sqrt{a^ 2u^2}}
(2)...

Oct704 07:21 AM
HallsofIvy

4 
1,180 
let,s suppose we have the equality:
f(x)g(x)=H(x) now we have that f(x) and H(x) have no Mellin transform..then...

Jul1205 04:26 AM
eljose

2 
971 
FIRST
What is the HIGHEST root? If there is a highest root, are there available any LOWEST root? Say, what is the...

Oct107 09:55 AM
HallsofIvy

6 
1,678 
let I be an interval in R, let f: I > R and let c belong to I. suppose there exists a constant K and L such that...

Mar905 04:50 AM
matt grime

1 
1,540 
I am completely self taught in Calculus, but I would like to have a better understanding of it before I go to College....

Nov2713 02:41 AM
SteamKing

5 
614 
Given two points in 3D, is there a way to find the slope of that line.

Jul2912 03:46 PM
HallsofIvy

3 
880 
Hi.
How do we argue that \nabla^2\frac{1}{r} is a three dimensional delta function? I have seen some people do it...

Jul3109 06:11 PM
daudaudaudau

5 
2,165 
i don't really understand the dirac delta function in 3D.
is it right that integral of f(r)d3(ra)dt = f(a)
...

Mar1311 11:20 PM
quietrain

6 
3,677 
I have a nifty expression
\frac{1}{r} = \frac{\rm{erf}(r/\alpha)}{r} + \frac{\rm{erfc}(r/\alpha)}{r}
I can...

Nov2410 09:28 AM
Morberticus

0 
629 
Hi,
I'm pondering the relation for the surface integral of a membrane
\sqrt{1+\nabla \psi \cdot \nabla \psi}...

Nov1810 11:55 AM
maverick_starstrider

3 
1,355 
I am attempting to write a C++ routine that will take a rectangle cube 3"x 2"y 1"z and rotate it by 90 degrees at a...

Feb910 07:08 PM
YaNvrNo

0 
581 
Hello everybody,
I am studying a theorem and I want to convert a function of one variable into a function of two...

Oct1810 07:27 AM
radou

3 
923 
I am having trouble getting started with this problem.. I guess I'll explain it first.
Find one possible matrix A...

Apr3005 11:15 AM
kleinwolf

1 
2,213 
Hey guys girls and thanks in advance
(Sorry if this post is in the wrong area)
Ive been working with splines in 2D...

Mar2412 05:49 PM
Trenthan

0 
759 
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 
682 
If I put these 2 lines in to wolframalpha.com it comes up with a solution
x = 1 + 2t , y = 2 – t , z = t ; x = 2...

May2111 11:41 AM
paulfr

2 
741 
Does a theorem exist for the derivation of a second or third derivative equation, without having to first derive the...

May2205 06:14 PM
whozum

12 
4,229 
(note for editor; this is not a homework problem, this is bred out of my desire to visualize 3space)
Hello fellows,...

Jan2912 07:04 PM
20Tauri

12 
2,278 
So each of three formulas has three variables. I am trying to picture this geometrically as if it were position...

Jul2808 02:25 PM
maze

3 
2,055 
I would just like to know what the 4 dimensional curl is?
I believe it is a matrix but I am not completely sure.
...

May1412 08:48 AM
dextercioby

6 
2,070 
Hi guys :)
Dont know mutch about statistics and i thought some of you might be able to help. I hope i am not off...

Jan1413 06:09 PM
elisaanalysis

9 
39,848 
x = r1cos(omegat) + r2cos(2omegat)
y= r1 sin (omegat) + r2 sin (2omegat)
1) Is this the equation of the graph of...

Sep1906 10:23 AM
Duhoc

10 
1,308 
It has been at least 5 years since my last math class and I am kinda struggling.
The question is:
Use the...

Sep904 06:26 AM
HallsofIvy

4 
796 
The qeustion was what is the 50th dy/dx of F(x)=Cos(2x)
this is what i did
1stdy/dx=2Sin(2x)...

Jul1704 09:48 AM
Galileo

4 
3,081 
Hello ppl,
I'm trying to solve these 6 improper integrals using calculus of residues.
OK, I have actually got 7...

Apr2607 09:32 AM
Eighty

4 
1,663 
hi,
im trying to find out how to get the inverse of the series 1/1+1/2+1/3+1/4....
i know the output of 30 is...

Jun1208 09:28 AM
shintashi

5 
2,785 
Here is the question:
At what point does the curve y=e^(32x) have maximum curvature?
I have tried this method:...

Feb1112 06:38 PM
Redbelly98

11 
1,790 
I have a question about a "game" I've thought up and I want to know if my logic is right, because if I'm wrong I fear...

Sep2312 01:52 PM
dumbQuestion

0 
818 
Here is the problem:
Suppose that g is a diffeomorphism on R^n. Then we know that its jacobian matrix is everywhere...

Apr1408 07:57 AM
ObsessiveMathsFreak

4 
1,925 
Are there any natural number solutions for
A + B + C + D = A x B x C x D
besides
{1, 1, 2, 4}?
What class...

Mar2608 03:47 AM
NickAlger

8 
6,550 
I'm a researcher of telecommunications. I was stumped by calculation of an integral when doing some proof. Would...

Feb2509 05:32 AM
leverrier

0 
1,086 
Thought someone might enjoy this:
I'm working through my multivariable calc textbook but got stumped for a bit by...

May1910 01:58 AM
bignum

10 
8,714 
I am not sure where to post this question, but I found this site through a google search. I ran across an equation...

Jun712 12:26 PM
AlephZero

1 
784 
Okay, I am new to calculus so can you guys just explain something to me.
What is exactly are you doing to a...

Jul2910 01:30 PM
zeromodz

12 
1,913 
How would I show that the series whose terms are given by
(cos n)/(1+n) does not converge absolutely? Thanks so much!

Nov2606 03:29 PM
d_leet

5 
1,359 
By definition, the sum of any two vectors of a vector space will be a vector in the same vector space. But does this...

Feb1710 05:55 AM
bpet

3 
1,208 