oki,
I gave it a try. The only problem I found was forming the integral between 2 and 4. It would not form into any sine or cosine with limits between 2 and 4. How should I go about it?
I need an example for deriving the Fourier series in exponential form of a periodic function that is a square wave with each cycle containing three 'stages' (attached) not just part negative and part positive. thanks.