Hi, I'm relatively new to SymPy, and enjoying it so far. I'm trying to analyze the harmonics that result when a sinusoid goes through a non-linear system. I have an expression that includes powers of a cos() and I want to expand it using the sum/difference angle identities. So I want
In [5]: some_function(cos(x)**2) Out[5]: 1/2 + cos(2*x) But I'm getting In [5]: expand_trig(cos(x)**2) Out[5]: cos(x)**2 I've tried expand_trig(), trigsimp(), expand() (with several different sets of hints), simplify(), and http://www.sympygamma.com/ and they all just return the same expression that I've given them. Any ideas would be much appreciated. Thanks, Jeremy -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/0abeae2e-6001-4f6b-86bd-c2c249fea30d%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
