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

Feb2313 09:24 AM
micromass

1 
46,556 
Hi,
Kinda need help for this question.
f(x,y) = ln(y2x)
1. Find the largest possible domain
2. Find the...

Oct1509 09:12 AM
Saunderssim

2 
2,696 
Hi:
Does anyone know of an explicit formula for the Real and Imaginary parts of GAMMA(1/2+I*y) as functions of y ?...

Oct1509 08:21 AM
g_edgar

1 
882 
Hi,
A damped harmonic oscillator is described by the following equation:
x" + 2*gamma*x' + omega^2*x = 0
which...

Oct1509 08:10 AM
Krampus

0 
1,247 
Is anyone familiar with any resources on the study of continuity of functions on the real line via gauges?
This is...

Oct1509 08:08 AM
g_edgar

1 
590 
I know d/dx of ln(x) is 1/x , x>0.
A website says d/dx of ln(x) is also 1/x for x not = 0 .
is that true , i am...

Oct1509 05:34 AM
rzaidan

6 
1,352 
Hi all. I've recently learned a shortcut for integration by parts, but don't know what it's called or where it comes...

Oct1409 06:05 PM
PhantomOort

6 
3,231 
My notes say the deriv. of inverse Cotangent is 1/(1+x2)
But when I plot the derivative of this function: ...

Oct1409 03:47 PM
Jules18

2 
826 
I feel a bit dumb, but could someone help me see this:
G(s):= \int_{\infty}^{\infty}f(x)e^{2\pi isx}dx =...

Oct1409 02:54 PM
HallsofIvy

3 
1,315 
I have a graph of B against I (mag.field v current) with error bars for uncertainties in both (although i'm not sure...

Oct1409 12:33 PM
mrausum

0 
590 
Optimize f(x,y,z) = 2x + 2y + 2z subject to constraints g(x,y,z) = x2  y2  z2  1 = 0 & h(x,y,z) = x2 + y2 +...

Oct1409 06:45 AM
HallsofIvy

4 
951 
Hi everyone. I am stuck in one of the assignment problems, and I think it's supposed to be simple, but it's just that...

Oct1409 05:07 AM
trambolin

1 
844 
Hi all,
A friend of mine asked me if i had any ideas about the following problem, i tackled it but with no success,...

Oct1409 12:56 AM
╔(σ_σ)╝

7 
1,439 
I'm trying to think of a word that describes the opposite of a trig function.
It's like inverse, but I know that's...

Oct1309 11:04 PM
Jules18

2 
713 
Suppose y = f(u), and u = g(x), then dy/dx = dy/du * du/dx.
In an intuitive "proof" of the chain rule, it has this...

Oct1309 09:36 PM
Quincy

6 
3,405 
I did know where in the math forums to post this, hope this is right.
Do elliptic functions along with elliptic...

Oct1309 06:52 PM
jasonRF

5 
2,265 
Optimize f(x,y,z) = x3 + y3 + z3, subject to the constraint g(x,y,z) = x2 + y2 + z2  1 = 0
Step 1:
I did L = f ...

Oct1309 03:44 PM
arildno

12 
1,218 
Hi everybody.
I have a simple question for experts of the forum. I must calculate a elliptic integral.. I do not...

Oct1309 02:13 PM
Carl_Weggel

3 
3,333 
i recently started my calculus III course but i was stuck with the derivative part when i derive a real number to the...

Oct1309 09:34 AM
develish16

3 
22,094 
hi all,
I've been trying to integrate this thing for ages.i tried using integration by parts using u=x^2,...

Oct1309 08:00 AM
emin

6 
1,470 
I have been asked to give an example of a function form R to R thats fails to have limit as x tends to infinity but...

Oct1309 06:02 AM
HallsofIvy

1 
861 
There is a surface defined by setting implicit function g(x)=0, where x is a 3 by 1 column vector, denoting a point on...

Oct1309 04:23 AM
trambolin

1 
4,314 
Optimize f(x,y,z) = x2 + y2 + z2  2x subject to the constraint g(x,y,z) = x2 + y2 + z2  25 = 0
Step 1:
L = f ...

Oct1309 12:04 AM
Office_Shredder

1 
676 
Why are they similar?
sin(a+b)=sin(a)cos(b)+cos(a)sin(b)
d/dx (f(x)*g(x))=f(x)g'(x)+g(x)f'(x)
Somewhere on...

Oct1209 10:17 PM
sokrates

3 
5,445 
Can anybody please show me an example of a convergent sequence of real valued functions of a real variable where the...

Oct1209 07:45 PM
symbol0

4 
1,399 
I need to compute the normal velocity of an evolving front in two dimensions (x,y). Let's say that I have collected...

Oct1209 02:39 PM
HughJass

0 
1,445 
Hello people,
I'm creating an algorithm on Matlab and need to find the distance between two points in spherical...

Oct1209 02:05 PM
TheDestroyer

5 
20,798 
i have these two question i need help
1. given y=3x2 find the percentage error in y if there is a 3.5% in the...

Oct1209 01:02 PM
LCKurtz

1 
944 
How close to 4 do we have to take x so that 3x + 2 is within a distance of (a) 0.1 and (b) 0.01 from 14?
...

Oct1209 01:01 PM
LCKurtz

1 
530 
is this trick valid at least in the 'regularization' sense ?? for example
\int_{\infty}^{\infty}...

Oct1209 07:36 AM
g_edgar

4 
1,004 
I'm having trouble calculating an integral:
\int_0^1{\frac{1}{1+\sqrt{x}}dx}
I decided to do a substitution:
...

Oct1209 05:22 AM
dragonblood

5 
21,444 
I've been trying to prove that if the following statement holds for all (x,y)ER^2, f must be a linear function:
...

Oct1209 01:09 AM
arildno

1 
949 
Preparing for the math test, and cannot understand what to do for one of my practice problems:
I need to find if...

Oct1109 04:29 PM
dlevanchuk

3 
4,461 
Hi,
Can anyone help me integrate :
Integral sqrt ( 4  x^2) dx
Some ideas:
Make a subsitution x2 = cos...

Oct1109 02:12 PM
pjkily

24 
63,896 
I'm a physics major (undergrad) who wants to learn real and complex analysis, but don't have the time to do the...

Oct1109 01:41 PM
profanilp

4 
6,097 
My course is using Rudin, however I've heard that it's not the best text for learning measure theory and extremely...

Oct1109 01:39 PM
profanilp

4 
4,865 
I was given f(x,y,z) = x4 + y4 + z4  x2  y2  z2.
I found that (or least I think it's these) x = 0 & \pm1/\sqrt{2},...

Oct909 09:43 PM
squenshl

2 
740 
1. The problem statement, all variables and given/known data
Can someone help me take the derivative of the integral...

Oct909 07:20 PM
LCKurtz

3 
983 
Can you always just swap the limits of integration and flip the sign of a onedimensional integral or is there a time...

Oct909 05:46 PM
Pythagorean

2 
8,165 
Hi,
Im having trouble understanding something in one of my Dynamics lectures.
The lecturer said that:
dr/dt...

Oct909 12:49 PM
HallsofIvy

2 
1,191 
given sequences \left\{x_n\right\}, \left\{y_n\right\}, is it true that
\sqrt{ \Sigma_{n=1}^{\infty} (x_n  y_n)^2}...

Oct909 09:31 AM
statdad

6 
3,948 