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

Feb2313 09:24 AM
micromass

1 
46,047 
I'm have some trouble distinguising definitions and require some help please:
is the epsilonn def. for...

Dec405 10:18 AM
Edgardo

5 
2,799 
Suppose you are given the equation of a line, and a given cosine function that the line intersects. How do you solve...

Dec305 12:39 PM
Edwin

6 
3,121 
Sorry if this is a wrong place to post this.
What does it mean that a turing machine M recognize language A?
Does...

Dec305 03:27 AM
Corneo

5 
5,117 
I understand hhow to use the chain rule for a simple 2 part composite function, however, I tend to have problems when...

Dec305 01:05 AM
benorin

4 
2,039 
If f is differentiable on (a,b), does it imply that f' is continuous on (a,b)? If so, is there a way of proving it?

Dec205 01:19 PM
Rocketa

11 
8,271 
I'm now studying Lebesgues measure on R^n, and when we finished constructing L (all measurable sets), we moved on to...

Dec105 10:05 AM
matt grime

15 
2,330 
So, I had a question for all of you, regarding the relationships between area and circumference, and surface area and...

Nov3005 02:29 PM
benorin

5 
10,610 
eval. double integal sprt(1+x^2+y^2)ds
S is helicoid and r(u,v) = ucos(v)i+usin(v)j+vk, with 0 <=u<=4 and 0<=v<=4pi...

Nov2905 03:39 AM
Galileo

1 
840 
Hi everyone
I need some help proving Pedoe's Inequality for two triangles, which states that
...

Nov2805 03:50 AM
maverick280857

8 
1,866 
Could somebody explain with due brevity why/how the set of padic integers is homeomorphic to the Cantor set less one...

Nov2705 11:39 AM
matt grime

1 
2,519 
hi there
im confused with this question..
Integrate 1) Sin(1/z) dz
and 2) Z sin (1/Z^3)
where Z is...

Nov2705 07:05 AM
HallsofIvy

3 
1,303 
I attempted to prove the following equality, but to no avail. Anyone is willing to lend a hand?
\int_0^{\infty}...

Nov2705 07:03 AM
benorin

5 
1,361 
This should be a proof of the fact that exp(x)*exp(y)=exp(x+y). Have a look at it:
\begin{align*}...

Nov2505 11:08 AM
shmoe

4 
3,730 
How does one conclude that \frac{d^{2} y}{dx^{2}} = \frac{dy\'/dt}{dx/dt} ?
Thanks

Nov2505 07:35 AM
John_Doe

7 
3,309 
The function of arclength c that minimises \int^b_{a}{y dx} is the catenary, but why? I have tried using calculus of...

Nov2505 12:03 AM
John_Doe

16 
1,683 
Id like to know if the following argument is valid.
Take an arbitrary function f(x). f(x)dx can be thought of an...

Nov2405 11:37 PM
dx

7 
1,726 
Lately, we've been going over these two theorems in class. I have a few questions to put forth.
1) I know that in...

Nov2405 10:06 PM
Hurkyl

3 
3,555 
Hi, I usually dont have any problems with Fubini's theorem, but there is something I just cant figure out. Let f be...

Nov2405 02:59 PM
Bernoulli

3 
3,137 
The covariant derivative is
A^\mu_{\sigma} = \frac{\partial A^\mu}{\partial x_{\sigma}} + \Gamma^\mu_{\sigma...

Nov2305 02:13 PM
pervect

31 
3,021 
Okay... i did solve it, but i wonder why the answer is what it is.
"a string 10 m long is cut in 2 so that one...

Nov2305 12:12 PM
Robokapp

4 
1,325 
Hello
I'm suppose to show
Given z^4 + z^3 + z^2 + z + 1 = 0 where
z = cos(\frac{2 \pi}{5}) + i sin(\frac{2...

Nov2305 12:12 PM
Bob19

15 
1,554 
Hi
I have a question regarding the use of de moivre formula:
I'm presented with a complex number z = (cos(v) + i...

Nov2305 09:03 AM
HallsofIvy

3 
2,361 
I am reading a electrical engineering book about digital signal processing, in the process, those fourier transform...

Nov2305 02:04 AM
kleinwolf

3 
3,568 
okay im supposed to prove the derivitive of: sqrt x/y + sqrt y/x
is equal to y/x
okay im stuck where i have...

Nov2205 11:16 PM
dx

3 
980 
hi everyone, im having trouble with a few problems, i was wondering if anyone can help me thank.
1.) given r= 11/22
...

Nov2205 04:49 PM
JessicaSTAR

3 
3,867 
given that near (1,1,1) the curve of intersection of the surfaces:
x^6 + y^4 + z^7 3xyz = 0 and
xy + yz...

Nov2105 10:36 PM
amcavoy

1 
932 
I apologize right now for the fact that I have no idea how to use LaTeX
I can't figure out if the following...

Nov2105 04:23 PM
NateTG

2 
1,654 
Hello everyone,
does someone know what the value of (with x < 1) is? I couldn't find it anywhere. :( Are there...

Nov2105 03:58 PM
mathman

1 
1,215 
I am familiar with the standard rule of mixed partial derivatives in that the order in which you partially...

Nov2105 10:19 AM
TD

3 
1,640 
I need help with this problem.
Find dy/dx if e^2x = sin(x+3y)
Any help would be great!
I began by taking the...

Nov2105 07:45 AM
courtrigrad

13 
1,857 
can someone PLEASE help me wit this problem? i will be ETERNALLY GRATEFUL. THANK YOU!!.
A light is suspended at a...

Nov2105 06:46 AM
HallsofIvy

3 
1,686 
Hello. I'm trying to fit my data to the Gompertz Survival given by Carrie, denoted by
y = exp
I've tried Data...

Nov2105 02:11 AM
relinquished™

0 
2,429 
Sorry..i posted this same question in another wrong section. This is the right one..
A line through the point...

Nov2005 11:59 PM
Tide

1 
1,161 
i don't understand how to figure this problem out, and i really need the help.
A kite is flying Y feet about the...

Nov2005 03:20 PM
Pseudo Statistic

2 
1,249 
I was wondering if any one could double check my work to see if the following method is correct. I will also check it...

Nov1905 02:58 PM
Edwin

0 
2,321 
My friend told me that they had just learned an equation to find the length of a function. I decided that it would be...

Nov1905 12:40 PM
TD

4 
11,858 
How would you solve the following system of simultaneous equations for t and b?
sin(pi*t) = 0
sin(pi*(t^2 +...

Nov1705 08:59 PM
Edwin

6 
1,400 
Count the number of integer solutions of (rather, # of integer lattice points such that)
n+\sum_{k=1}^{n} \left...

Nov1705 05:44 PM
AKG

1 
4,866 
Hi,
Is there a general extrapolation formula (or other *simple* quantitative technique) for projecting values in a...

Nov1705 03:47 PM
mathman

2 
3,525 
Hi,
it is probably a simple question, but it bothers me for quite some time.
How can I calculate time that ball...

Nov1705 07:45 AM
benorin

4 
1,202 