I'm trying to find the Fourier series for: $$ r_a(x)=\left\{\begin{array} & \frac{1}{2a} \quad |x|<a \\ 0 \quad a<|x|<\pi \end{array}\right.$$
I'm having problems because of the discontinuity and I'm ask to find the values for the Fourier series for the discontinuity point and the end of the interval.