# Calculus

- Elementary functions. Calculating limits, derivatives and integrals. Optimization problems
 Views: 369 Announcement: End of year contest, $75+$50 prize! Dec18-13 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 10:24 AM micromass 1 37,751 I've been reviewing Euler's proof for \zeta(2) and though some of you might find it interesting too. We wish to find:... Jun30-05 06:39 AM Hurkyl 26 3,869 I've been trying to figure out how to calculate the exact area of a ruled surface. I think I've come to a solution... Jun30-05 02:12 AM bomba923 4 1,622 I attached this integran (see picture). If I put this in my calculater he doesn't give me a formula independant of... Jun29-05 02:32 PM rachmaninoff 9 2,279 Here is the problem: \int ^2_1 \frac{dx}{(3-5x)^2} u = 3-5x du = -5dx dx = -\frac{1}{5} du Jun29-05 02:24 PM Jameson 1 788 Does dx/dt = dv or just v(avg.)? Thanks Jun28-05 10:18 PM dextercioby 1 18,862 Here is the question: Evaluate the surface integral ∫∫s (X^4 + Y^4 + Z^4) dσ, where dσ is the surface element and... Jun28-05 07:58 PM defang 18 2,497 how do you determine the equation of a parabola, using transformation rules Jun28-05 05:37 PM James Jackson 1 4,576 This one has me stumped, I dont even know where to start. -Find the area of the triangular region in the first... Jun28-05 02:30 PM geniusprahar_21 7 1,378 I guess I am having trouble understanding this problem. I don't even really know where to start, or what rules to... Jun28-05 02:14 PM geniusprahar_21 1 1,899 im havin trouble evaluating integral \int_0^\infty\frac{x^{3}}{e^x-1}dx i tried integrating by substitution but got... Jun28-05 08:06 AM saltydog 16 2,005 hi, Lt (exp)x/x I couldnt solve this in any way;neither my friends could. x->0 So it is a need... Jun28-05 07:36 AM saltydog 29 1,751 Hello, it is an honor to finally post on this forum. I have been lurking around for a couple of months now and have... Jun28-05 01:13 AM JohnRV5.1 2 1,515 i am looking for an equation (integral) , so that i can predict what width to make a coil of wire , of certain length... Jun27-05 11:14 AM willib 2 770 Hello everyone, I posted this question before also but did not get the satisfactory answer. So I am posting the... Jun27-05 08:39 AM Dr.Brain 4 1,706 I know that a tangent plane is given by: a(x-x_0)+b(y-y_0)+c(z-z_0)=0 Where is the gradient vector. ... Jun26-05 11:34 AM amcavoy 10 23,974 hello all well iv been workin on this problem but no matter how many ideas cross my mind i cant prove it, iv tried... Jun26-05 09:27 AM saltydog 3 1,439 Could someone please help me, I do not understand how the author of my text book gets from one point to another. Here... Jun25-05 10:44 PM JoshHolloway 8 1,889 Can someone give me a hand with this problem - Its screwing with my head! :frown: The derivative of the function... Jun25-05 03:43 PM GCT 20 4,696 Hello everyone, My question is -- Suppose we have two planes intersecting each other in some line. If we know a point... Jun24-05 11:38 AM neurocomp2003 2 1,969 hello all im in the middle of proving that if f and g are integrable functions then show that fg is also integrable... Jun24-05 01:51 AM quasar987 4 4,028 I'm having trouble with this. Can anyone help me integrate sqrt(2+2sin(x)) ?? Thanks Jun23-05 07:26 PM steven187 6 901 Hi there I have got a maths exam tomorrow, and i have to try and get a distinction grade to get into university, so... Jun23-05 10:59 AM Tino 6 1,034 How? I know that a scalar quantity only comprises of magnitude while a vector consist of both magnitude and... Jun23-05 06:33 AM dextercioby 2 11,610 I'm having some problems with this following min/max problem. C= 0.25t{e^-^0^.^3^t} I am being asked to find the... Jun23-05 12:04 AM Samael 9 4,398 Hey guys, my professor assigned an extra credit problem worth a good 100 points, I would appreciate if someone can... Jun22-05 11:36 PM Jameson 17 4,722 hello all Iv been working on alot of integrability questions and im having trouble with this problem let f be... Jun22-05 12:31 PM quasar987 3 3,286 hello all well I was working through Riemanns Criterion : let f be a bounded function on the closed interval .... Jun22-05 11:47 AM rachmaninoff 19 3,950 Please help me on this. I am trying to make and exercise from an author M.D. Hatton (an english). Let x = x(r, w) =... Jun22-05 09:56 AM Castilla 12 3,869 Hi Ho! :smile: Mmmm... I have a problem with this one: \lim_{x\rightarrow-\infty} \frac{x}{\sqrt{z^2+x^2}} ... Jun22-05 04:57 AM dextercioby 2 2,042 hello all i have been trying to prove a property of integrable functions, i had a go at it dont know if it is... Jun21-05 11:54 PM steven187 12 1,134 \forall n > 0,\;n \in \mathbb{R} , does \int\limits_n^\infty {\frac{{\sin x}} {x}dx} converge? If so, to what? Jun21-05 04:58 PM dextercioby 5 949 What is δ that they keep refering to in this definition? They first bring it up as if it's some quantity I'm supposed... Jun21-05 03:04 PM SteveRives 8 925 I want to know how the area between two curves can be determined,do i just multiply the functions and then equate... Jun21-05 07:10 AM whozum 6 830 Hi all, I've come by an interesting while studying. Here it goes The volume V=x^3 of a cube of with edges of... Jun20-05 06:42 PM HallsofIvy 1 1,288 hello, i am supposed to use the two variable chain rule to confirm that changing variables from (x,y) to (v,w) with... Jun20-05 05:12 PM fishingtreeing 5 1,262 hello all I was workin on a problem and during my proof I came to this problem does anybody know what happens with... Jun20-05 11:17 AM quetzalcoatl9 3 1,183 hello all well i think im kind of brain dead, iv been workin on alot of problems over the last few days, I cant... Jun19-05 04:33 PM saltydog 5 1,627 g(t)=t\sqrt{4-t},t<3 g'(t)=t+(4-t)^1/2 Jun19-05 11:11 AM saltydog 3 1,136 hello all i have been working on this problem, see i can see how it could be true but i dont know how to prove... Jun18-05 11:40 PM mathwonk 14 2,498 Hi, I suppose my question has to do with planes in general, rather than just tangent planes. Say you have a plane... Jun18-05 06:49 PM amcavoy 7 7,419