1. The problem statement, all variables and given/known data Write f(t) = 1 + t as fourier series, with only cosine terms in the interval [0,pi] For which values of t does the series converge to f ? 3. The attempt at a solution Expand f = 1+t as an even function about t=0; so it will be a zig-zag with non continous points at -pi,0,pi, 2pi etc the first part is simple, but the second; I was thinking that the Fourier series is converging to f, exept where f is not continous. So the answer is [tex] t \in ]0,\pi[ [/tex] Is that correct?