# Calculus

- Elementary functions. Calculating limits, derivatives and integrals. Optimization problems
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 Meta Thread / Thread Starter Last Post Replies Views Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions... Feb23-13 09:24 AM micromass 1 40,052 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 pwsnafu 2 434 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 dextercioby 4 3,593 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 squenshl 2 687 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 Bipolarity 2 556 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 3 888 I have been studying the 'resummation' methods for divergent series..however i have some questions of critcs. ... May26-07 04:18 AM tpm 0 1,164 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 dextercioby 1 714 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 3,152 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 azizz 2 932 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 Phrak 16 1,151 Hi all, Just having some trouble understanding a certain example of cross product. It's actually for physics, but... Nov18-11 03:40 PM mathman 5 1,176 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 timewalker 10 14,452 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 7 443 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 nburo 2 3,493 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 EricTheWizard 2 3,813 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 dextercioby 3 11,808 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 Mathoholic! 2 2,006 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 timthereaper 4 725 "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 mkkrnfoo85 2 1,009 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 Nachtwolf 4 1,851 How do you find ∫ cscx dx? Nov16-03 12:37 AM reinhard_t 13 6,849 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 lurflurf 4 586 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 HallsofIvy 1 1,865 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... Jan3-08 03:29 PM HallsofIvy 3 1,418 on a ti83 calculator, how do you put in cubic roots? Sep24-03 01:36 PM StephenPrivitera 2 2,574 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 andylu224 3 956 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 CompuChip 9 2,897 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 lamarche 8 2,253 These identities might be considered as true: \begin{array}{rcl} 1 - 1 + 1 - 1 + \cdots & = & \frac{1}{2} \\ ... Jun2-10 01:00 PM g_edgar 20 2,216 i am having trouble with understanding the physical significance of these two operators. Aug16-07 05:49 AM dx+dy 6 2,521 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 Termotanque 0 971 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 1,616 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 rockyshephear 0 1,295 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 Amok 8 5,087 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 lurflurf 3 5,421 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 HallsofIvy 2 1,657 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 HallsofIvy 3 1,389 Can someone give me analogies for each of these? I know the standard ones so try to be creative. I just received an A-... Dec22-08 09:55 PM daytripper 17 3,096 Have a parametric surface of revolution formed by the hyperbolic spiral equation. The 2d equation is y=1/x. The... May7-11 08:05 PM trustthrust 0 1,141 A quick question. In stewart, the curvature is defined as: \kappa = \abs(\frac{dT}{ds}) and it says that: ... Jul28-05 04:51 PM Crosson 26 2,875

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