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

Feb2313 09:24 AM
micromass

1 
46,045 
Find Critical Numbers of:
F(z) = (z+1)/(z^2+z+1)
Did I start off correctly??
D/dz =  (z + 1)(2z+1)/(z^2+z+1)...

Nov606 04:24 PM
mathman

1 
2,176 
how do you find critical numbers, and do you have to keep on plugging in a number until you find zero or is their an...

May207 10:54 AM
HallsofIvy

5 
5,220 
I am a bit confused over something that should be relatively easy to research , however, I am having a hard time...

Mar413 09:35 AM
runningninja

1 
506 
V(x) = x(102x)(162x)
When i V'(x) = 0... x is always a non real number... I don't know why, can someone help me...

Nov2103 12:35 AM
ShawnD

1 
1,398 
let f(x)=sin(1/x)*x^2 for x not 0, and f(0)=0. show that x=0 is a critical point for f which is neither a local...

Nov1704 07:40 AM
arildno

7 
1,422 
what can be said about the function f, if f is continuous on , and for some c in (a,b), f(c) is both a local maximum...

Nov2404 02:00 PM
trap

2 
1,109 
for cos y the critical points are n*pi  0.5*pi
for cos 2x, the critical points should be n/2 * pi  0.25*pi ...

Feb213 06:07 PM
pwsnafu

2 
486 
hi guys i'm stuck on this, i keep thinking i have the right answeres but i can't get them.
the function is f(x):...

Mar1305 03:59 PM
cronxeh

6 
1,079 
Ok so i got a mathematica assignment that asks "Find and classify the critical points of f(x,y)= 510xy4x^2+3yy^4
...

Mar2905 11:38 AM
dextercioby

4 
3,744 
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 
733 
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 
602 
Hi, Everyone:
I am having trouble figuring out what the critical points would be for any such map
f:R^n...

Oct210 05:42 AM
Petr Mugver

3 
932 
I have been studying the 'resummation' methods for divergent series..however i have some questions of critcs.
...

May2607 04:18 AM
tpm

0 
1,209 
Hi,
This is my first post. Sorry for the mistakes it certainly contains.
I have two questions. First, is there a...

Apr2611 02:12 AM
dextercioby

1 
767 
AX(BXC) = B(A(dot)C)  C(A(dot)B)
For the left hand side I got
(AyBxCyAyByCx+AzBxCzAzBzCx)x(hat) +...

Jan1205 07:35 PM
Dr Transport

6 
3,262 
Hey,
I have a problem that can be written in the following form:
u=v x w
where u, v, w are 3by1 vectors and x...

Apr3011 06:39 AM
azizz

2 
973 
I just saw an instructor of EEE (YouTube) talk about Cross Product. He gave an example of when cross products are...

Jul2809 06:41 PM
Phrak

16 
1,223 
Hi all,
Just having some trouble understanding a certain example of cross product. It's actually for physics, but...

Nov1811 03:40 PM
mathman

5 
1,271 
Hi.
I have an integral of a cross product:
\int a\times b(t)dt
a does not depend on t. How can I move it...

Oct1611 01:29 PM
timewalker

10 
15,007 
Hi everyone,
What does \int \vec{f} × \vec{dl} mean? does it mean "The Line Integral of Vector Function on a...

Feb1114 07:23 AM
Simon Bridge

7 
608 
Hello guys, this must be a very trivial question, but I just don't see it.
Ihave a "vectorized quaternion"...

Jul809 01:57 PM
nburo

2 
3,695 
Hi, I've been trying to derive the electromagnetic stress tensor on my own, and I've run into a bit of a problem. I...

Dec2910 11:21 AM
EricTheWizard

2 
4,056 
Is there any neat way/rule to write:
\vec B \times (\vec \nabla \times \vec A)
?
I've tried it myself and found...

Mar105 06:53 PM
dextercioby

3 
12,175 
The cross product between two vectors \vec{A}x\vec{B} and \vec{C} is given by the following equation:...

Mar712 08:09 AM
Mathoholic!

2 
2,102 
I have a question. Lets say you have three distinct, non zero vectors that lie in the same plane. Can I verify the...

Mar813 01:39 PM
timthereaper

4 
832 
"The area of a parallelogram spanned by two vectors, v1 and v2, is v1 X v2."
Would someone help me understand...

Apr2205 02:51 AM
mkkrnfoo85

2 
1,083 
If the area enclosed by an ellipse 4x^2+y^2=1 and its cross section is perpendicular to the xaxis then its volume is?...

Jan2604 06:31 PM
Nachtwolf

4 
1,943 
How do you find ∫ cscx dx?

Nov1603 12:37 AM
reinhard_t

13 
6,971 
The volume of a sphere with radius r is
v = \frac{4}{3}\pi r ^{3}
It makes sense that its derivative with...

Jul2313 05:57 PM
lurflurf

4 
750 
The question im looking at states:
Prove that the elliptical function x^2 + 3y^2=b is orthogonal to the cubic...

Nov307 06:33 AM
HallsofIvy

1 
1,926 
Hi
The curve C has equation y = f(x) and the point P(3,5) lies on C
Given that
f'(x) = 3x²  8x + 6
The...

Jan308 03:29 PM
HallsofIvy

3 
1,474 
on a ti83 calculator, how do you put in cubic roots?

Sep2403 01:36 PM
StephenPrivitera

2 
2,638 
So this is not an homework question, and I have solved the integral...
Just it took alot of time and was very...

Jul811 09:08 AM
andylu224

3 
1,042 
It's clear that f(x)=e^x has no solution for f(x)\le0. So can there be imaginary solutions for values not in the range...

Oct2707 05:14 AM
CompuChip

9 
2,991 
The integral I am seeking to evaluate is
int_{\inf}^{+\inf) exp(w/2) exp( i w ) dw
a definite integral which...

Dec2810 10:25 AM
lamarche

8 
2,357 
These identities might be considered as true:
\begin{array}{rcl}
1  1 + 1  1 + \cdots & = & \frac{1}{2} \\
...

Jun210 01:00 PM
g_edgar

20 
2,321 
i am having trouble with understanding the physical significance of these two operators.

Aug1607 05:49 AM
dx+dy

6 
2,566 
I noted that if f : C \to C is holomorphic in a subset D \in C, then \nabla \by \hat{f} = 0, \nabla \dot \hat{f} = 0....

Aug1111 01:45 PM
Termotanque

0 
1,042 
Hello people!
I've been working on this problem, but I can't find how differentials of V on the left side of the...

Apr1004 12:33 PM
matt grime

1 
1,723 
Regarding the equation for curl:
Nable E literally means the sum of the differences of certain rates of change with...

Jun1709 05:22 PM
rockyshephear

0 
1,386 