1. The problem statement, all variables and given/known data I need to find the coefficients for a fourier expansion. Here is the integral I need to solve: (1/π) ∫sin(x/2)sin(nx)dx where the limits are from -π to π. The original function for the expansion is f(x) = sin(x/2) 2. Relevant equations None 3. The attempt at a solution Should I do this in terms of complex numbers? I think that should be my approach but I am not sure. If this is the right approach can you help me get started with setting up the integral?