Hello, I am trying to derive the harmonic content of a signal passing through a transistor's transfer function. After a Taylor expansion in Mathematica 7, I have the expanded equation and the next step is to reduce everything to first order Sine/Cosine functions. In Mathematica, if I have a term like (A Sin (wt) )^3 What function can I use to reduce this down? Doing it by hand it should look something like a Sin(wt) - b Sin(3wt) + c Sin(wt) where a,b,c are the collections of constants. Any idea how I can do this reduction in Mathematica? I can't seem to get/find a function like TrigReduce to do what I want. Thanks for any help.