Hi. My problem is that even though I can find the Fourier series, its coefficients etc. I have trouble determining the period of equation. For example lets say we have f(t) = t, t [itex]\in[/itex] [-pi,pi]. I thought that the period was 2pi but in the solution it says that the period is pi. This isn't the first time that I couldn't determine the period of an equation in order to find the Fourier series. Can someone make things clear for me? Thanks.