So I've been asked to find the fourier series of $\frac{x}{\pi}$ between $[-\pi,\pi]$, which is fine, I can do this however, the question also says that "$f(x) = f(x + 2\pi)$" how does this change what I need to do?
I know the process of finding the fourier series/coefficients, I'm just not sure how the $f(x)=\dots$ part affects my answer/working out.
Any help would be appreciated