Problems about Fourier expansion?

kring_c14
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Homework Statement



just wondering if anyone knew a website that has solved problems about Fourier expansion??

all i can find are notes and discussions about it..

a gazallion thanks everyone

Homework Equations





The Attempt at a Solution

 
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Is Fourier series and Fourier expansion just the same?
 
The problem is that to solve Fourier expansion problems you just have to be able to integrate... nothing more. So if you can't do a problem, practise your integration! A Fourier series is what you get when you perform a Fourier expansion.
 
ahhh.. now i understand.. thank you..
 

Thread 'Finding the nth roots of a complex number'

There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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