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

Feb2313 09:24 AM
micromass

1 
46,213 
Hey, I'm going over series expansions and was wondering if someone could check my work and tell me if my work is...

Apr2612 05:35 AM
d.tran103

2 
949 
Hey, how do I determine whether or not points lie in a straight line? Is there a symbolic approach to determining so?...

May2312 07:57 AM
HallsofIvy

8 
3,813 
How do you integrate 2exp(1x).dx?
The expression describes the cumulative number of cells as a function of cell...

Jul1410 08:38 AM
HallsofIvy

1 
1,776 

Ok this is the question I had on a...

Nov404 12:14 PM
matt grime

1 
930 
Can somebody please explain to me why
sin(x+h) = sinxcosh + cosxsinh
in detail.

Oct2904 07:07 AM
matt grime

3 
882 
kindly make h or d the subject of the formula
y={1/2pi(dh)}ln(d/h)
thank u
Moderation Note: email address...

Dec508 10:08 AM
Defennder

1 
1,020 
Can anyone explain me how to solve this
http://i.imgur.com/nPs2U.jpg

May511 05:34 PM
gb7nash

1 
1,053 
is this relashion true? or false?
if it is true how can I proof it?
(i)^(m) = cos((m*pi)/2)+i*sin((m*pi)/2)

Sep2409 10:52 AM
dado033

3 
629 
The integral of e is e right? So if you were to take the integral of 24+e^(5t) (acceleration), it would be 24t+e^(5t)...

Jun2906 08:41 AM
HallsofIvy

4 
97,396 
I'm trying to solve this problem:
Compute \oint_c(y+z)dx + (zx)dy + (xy)dz using Stoke's theorem, where c is the...

Aug905 08:31 AM
HallsofIvy

1 
1,327 
Forgive the basic question but my Google Fu isn't strong enough in math.
I understand that for constant velocity...

Apr712 04:24 PM
dag45hol

7 
1,020 
Let a,b,x,y\in\mathbb{R} and f\left(a,b\right)=...

Oct510 04:28 PM
dagrgGS

0 
680 
Let a,b,x,y\in\mathbb{R} and f\left(a,b\right)=...

Oct610 07:26 AM
dagrgGS

0 
670 
If anyone can help i seem to have reached a breakdown somewhere down the line or am simply lacking in some knowledge...

Sep612 09:49 PM
DahnBoson

4 
1,028 
Are inflection points critical points?
and what about at the value that f(x) undefined? Is that critical point too?

Nov412 03:25 PM
Bipolarity

2 
605 
We know that d(cos^1 (x/a))/dx = 1/sqrt(a^2  x^2) (assuming a and x are positive)
So...Why the integral of...

Dec1712 01:16 PM
sahil_time

6 
1,096 
i know if every simple closed curve in D can be contracted to a point it is simply connected as in the case ofR^2...

Mar710 10:21 PM
Tinyboss

1 
448 
Is the following proof that the rationals are dense in the reals valid?
Theorem: \forall x,y\in\mathbb{R}:x<y,...

Jun1911 03:50 AM
dalcde

7 
2,522 
Is it true that finite sets don't have limit points?

Jun2111 02:10 AM
dalcde

6 
786 
How did Newton's original formulation of Calculus look like? I've heard that it was more intuitive and fun than the...

Jul911 10:16 AM
somed00d

6 
1,812 
Is there an elegant and simple proof of the Chain Rule? Every proof I've found is complex and mindboggling

Aug1011 12:56 AM
I like Serena

25 
3,920 
In Wikipedia, it is said that
\mathrm dy=\frac{\mathrm dy}{\mathrm dx}\mathrm dx.
Can we divide both sides by...

Aug2611 06:48 AM
dalcde

11 
1,143 
Hi all, I need answers and EXPLANATION to the following problems: (Please Help!)
(i) f : N > N defined by f(x) =...

Sep1909 02:59 AM
Hurkyl

1 
643 
Hey all,
can you check out this site
http://www.mathisfunforum.com/viewtopic.php?pid=49738
In the very first...

Jan2909 03:10 PM
tinytim

1 
995 
Hi all,
I'm doing some reading on hyperspheres.
I am curious why the volume of n1 hypersphere (a line segment)...

Feb409 02:02 PM
Damascus Road

0 
993 
Hi!
Sorry if this is a bit trivial, I was wondering if there is a way of converting a series
...

Jan910 03:14 PM
rochfor1

1 
2,777 
Is it true that
\int_0^1 f(x) dx \in \mathbb{Q} \Rightarrow \int_0^1 x f(x) dx \in \mathbb{Q}
?
(Suppose ...

Sep111 01:04 PM
Damidami

4 
1,065 
I think I'm not understanding something here:
A point L \in \mathbb{R} is a limit point of a sequence a_n if exists...

Sep1411 01:06 PM
alexfloo

5 
2,504 
I have read somewhere that we can extend the notion of a series of a sequence
\sum_{i=1}^{\infty} a_n
to sums over...

Nov1311 10:35 AM
micromass

3 
1,502 
I was reading this article of wikipedia:
Conditional and absolute convergence
It says:
"An absolutely...

Nov2511 04:54 PM
Damidami

4 
1,575 
I read that an alternating series \Sigma (1)^n a_n converges if "and only if" the sequence a_n is both monotonous...

Nov3011 01:06 PM
Damidami

2 
913 
I'm studing the RiemannStieltjes integral \int_a^b f dg on closed intervals of the real line, and the natural...

Dec911 03:31 PM
mathman

1 
1,228 
I know that this function f : \to \mathbb{R}
f(x) = \begin{cases} 1 & \textrm{ if } x \geq 0 \\ 0 & \textrm{ if }...

Dec911 10:26 AM
Stephen Tashi

1 
865 
Let f(x,y) = ( \frac{y}{x^2 + y^2}, \frac{x}{x^2 + y^2}) with f : D \subset \mathbb{R}^2 \to \mathbb{R}^2
I...

Dec2411 07:13 AM
Damidami

3 
1,240 
Hi,
I'm trying to fix in my head a very precise definition of what to mean for an euclidean space, as we use it in...

Dec3011 06:04 PM
D H

23 
2,438 
I am teaching a student in a course without partial differentiation so
I can only think of the following method
let...

Sep2906 06:59 PM
Damned charming :)

0 
2,343 
If t is constant then
both cos(t +x) + i sin(t+x)
and * both satisfy the differential equation
dy/dx = i y
and...

Oct2206 11:28 PM
Damned charming :)

0 
1,255 
Hi All,
This is not a homework question, I am just trying to be come quicker at integrating by parts, when...

Mar411 06:12 PM
jhooper3581

4 
1,259 
I am reading through a worked example of the Taylor series expansion of Sinh(z) about z=j*Pi
The example states: ...

Nov2011 05:38 AM
HallsofIvy

3 
1,878 
Hi!!
I'm having a little problem with an exercise and I dunno how to sort it out.
Basically what I have is a...

Aug3011 08:46 AM
Hootenanny

1 
975 