# Recent content by overseastar

1. ### Doing the following integral

I haven't done basic integrals for awhile...but just wondering how you would integrate the following functions without looking it up in the integral table. (x^2+a^2)^(-3/2) where a is a constant. Thanks!
2. ### Body Diagonals of a cube

oh, if that's the case, I think I got it LOL Thanks a bunch!
3. ### Body Diagonals of a cube

i used a unit cube. with one diagonal at (0 0 1) (1 1 0) the other diagonal at (0 0 0) (1 1 1) but it doesn't work, hmmm...for a sec i thought i did get it.

5. ### Body Diagonals of a cube

When drawing the vectors in the case within the cube, do they have to be from the same origin?
6. ### Body Diagonals of a cube

I seem to be getting an answer of 45 degrees which isn't right...
7. ### Body Diagonals of a cube

I have the same problem, yet, I still can't picture it.
8. ### Finding the particular solution of DE

Sorry, I guess I should be more specified. It asked us to use the Fourier Series Method.
9. ### Finding the particular solution of DE

the question is asking us to solve this nonhomogeneous problem: Utt = Uxx + sin(x)sint(t) and I think in one step of the calculations, we need to find the general solution of sin(x)sin(t) along with the particular solution. Or is there another way to approach this question?
10. ### Reciting Pi

Came across a cool site related to pi earlier: http://pi.ytmnd.com/
11. ### Finding the particular solution of DE

I have a nonhomogeneous DE and wants to find the particular solution for Asin(x)sin(t) Is there any tips in using method of undetermined coefficient to guess the particular solution of this?
12. ### Finding an orthonormal system

Ok, I finally understand the part after the unit vector. What is the next step once I've got the unit vector for each of the function?
13. ### Introduction to Fourier Integral

Sorry, that was just a little assumption I made, matt grime. i guess i should learn to start linking all my math concepts from the two types courses together. The original question says that the 3 orthogonal functions are with respect to the weight function 1 on the interval [-1,1]
14. ### Finding an orthonormal system

So if i were to rewrite the 3 functions in terms of vectors, would they become like this? 0 0 1 <-- 1 0 1 0 <-- x 3 0 -1 <-- 3x^2-1 so 1st vector would be 0 0 3 ?
15. ### Finding an orthonormal system

:bugeye: I'm not a very wordy person and I learn from seeing equations and numbers and examples, I guess it's kinda hard to explain it like that. Thanks for your help, I'll think about it for now. according to my notes, it says that a system of orthogonal functions w.r.t. weight q of [a, b]...