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- Elementary functions. Calculating limits, derivatives and integrals. Optimization problems
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Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:24 AM
1 40,127
V(x) = x(10-2x)(16-2x) When i V'(x) = 0... x is always a non real number... I don't know why, can someone help me...
Nov21-03 12:35 AM
1 1,336
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...
Nov17-04 07:40 AM
7 1,349
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 ...
Feb2-13 06:07 PM
2 438
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):...
Mar13-05 03:59 PM
6 1,029
Ok so i got a mathematica assignment that asks "Find and classify the critical points of f(x,y)= 5-10xy-4x^2+3y-y^4 ...
Mar29-05 11:38 AM
4 3,597
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},...
Oct9-09 09:43 PM
2 688
Are inflection points critical points? and what about at the value that f(x) undefined? Is that critical point too?
Nov4-12 03:25 PM
2 559
Hi, Everyone: I am having trouble figuring out what the critical points would be for any such map f:R^n...
Oct2-10 05:42 AM
Petr Mugver
3 889
I have been studying the 'resummation' methods for divergent series..however i have some questions of critcs. ...
May26-07 04:18 AM
0 1,167
Hi, This is my first post. Sorry for the mistakes it certainly contains. I have two questions. First, is there a...
Apr26-11 02:12 AM
1 716
AX(BXC) = B(A(dot)C) - C(A(dot)B) For the left hand side I got (AyBxCy-AyByCx+AzBxCz-AzBzCx)x(hat) +...
Jan12-05 07:35 PM
Dr Transport
6 3,158
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...
Apr30-11 06:39 AM
2 933
I just saw an instructor of EEE (YouTube) talk about Cross Product. He gave an example of when cross products are...
Jul28-09 06:41 PM
16 1,152
Hi all, Just having some trouble understanding a certain example of cross product. It's actually for physics, but...
Nov18-11 03:40 PM
5 1,179
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...
Oct16-11 01:29 PM
10 14,475
Hi everyone, What does \int \vec{f} \vec{dl} mean? does it mean "The Line Integral of Vector Function on a...
Feb11-14 07:23 AM
Simon Bridge
7 451
Hello guys, this must be a very trivial question, but I just don't see it. Ihave a "vectorized quaternion"...
Jul8-09 01:57 PM
2 3,497
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...
Dec29-10 11:21 AM
2 3,824
Is there any neat way/rule to write: \vec B \times (\vec \nabla \times \vec A) ? I've tried it myself and found...
Mar1-05 06:53 PM
3 11,826
The cross product between two vectors \vec{A}x\vec{B} and \vec{C} is given by the following equation:...
Mar7-12 08:09 AM
2 2,012
I have a question. Lets say you have three distinct, non zero vectors that lie in the same plane. Can I verify the...
Mar8-13 01:39 PM
4 732
"The area of a parallelogram spanned by two vectors, v1 and v2, is ||v1 X v2||." Would someone help me understand...
Apr22-05 02:51 AM
2 1,012
If the area enclosed by an ellipse 4x^2+y^2=1 and its cross section is perpendicular to the x-axis then its volume is?...
Jan26-04 06:31 PM
4 1,852
How do you find ∫ cscx dx?
Nov16-03 12:37 AM
13 6,857
The volume of a sphere with radius r is v = \frac{4}{3}\pi r ^{3} It makes sense that its derivative with...
Jul23-13 05:57 PM
4 589
The question im looking at states: Prove that the elliptical function x^2 + 3y^2=b is orthogonal to the cubic...
Nov3-07 06:33 AM
1 1,871
Hi The curve C has equation y = f(x) and the point P(3,5) lies on C Given that f'(x) = 3x - 8x + 6 The...
Jan3-08 03:29 PM
3 1,419
on a ti83 calculator, how do you put in cubic roots?
Sep24-03 01:36 PM
2 2,577
So this is not an homework question, and I have solved the integral... Just it took alot of time and was very...
Jul8-11 09:08 AM
3 959
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...
Oct27-07 05:14 AM
9 2,899
The integral I am seeking to evaluate is int_{-\inf}^{+\inf) exp(-|w|/2) exp( i w ) dw a definite integral which...
Dec28-10 10:25 AM
8 2,255
These identities might be considered as true: \begin{array}{rcl} 1 - 1 + 1 - 1 + \cdots & = & \frac{1}{2} \\ ...
Jun2-10 01:00 PM
20 2,219
i am having trouble with understanding the physical significance of these two operators.
Aug16-07 05:49 AM
6 2,522
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....
Aug11-11 01:45 PM
0 973
Hello people! I've been working on this problem, but I can't find how differentials of V on the left side of the...
Apr10-04 12:33 PM
matt grime
1 1,617
Regarding the equation for curl: Nable E literally means the sum of the differences of certain rates of change with...
Jun17-09 05:22 PM
0 1,299
Can anyone show me how you get the curl in polar or spherical coordinates starting from the definitions in cartesian...
Apr22-11 06:08 PM
8 5,101
I have a number of books which give a vector identity equation for the curl of a cross product thus: \nabla \times...
Feb27-11 07:33 PM
3 5,450
Okey Dokey, so I'm bored and decided to play around with some math. I've got a problem that I can't figure out now; I...
Mar11-07 07:10 AM
2 1,661
trying to remember rules for curl test applicability. is it just simple closed curve? is F=-ysin(x)i+cos(x)j...
Dec6-10 09:54 AM
3 1,390

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