Hello, I'm trying to find a series expression for the triangle waveform through some messy math. I've reduced the problem down to solving the integral: Integrate[ 1/w^2 * (1-Cos[T*w/2]) * Exp[(1-n)*I*t*w ] with respect to w from -Infinity to Infinity T is a constant, I is Sqrt[-1], and n is an integer. Mathematica cannot evaluate this integral, but if I use the function InverseFourierTransform and substitute a specific value of n, mathematica works. I plotted for a couple of n's and I know this is the integral I want. I tried doing the integral through residues, but the only singularity I can see is w = 0 and the residue there is zero. The problem is Ex. #5 part d of http://www.hep.caltech.edu/~fcp/math/distributions/distributions.pdf (scroll all the way down to the bottom) Is there some residue I'm not seeing? Thanks!