Find the Fourier series on the interval [-pi, pi] of the EVEN function:

f(x) = { -x for x < 0

{ 0 for x = 0

{ x for x > 0

So we are given the hint, that its an even function... which I believe means we only have to solve for the a sub n's..

However, we just went over this in class on friday... can you show me how to proceed? Thanks in advance!