Comment #5 on issue 1590 by [email protected]: Reduce powers of sin's and
cos's to multi-argument functions
http://code.google.com/p/sympy/issues/detail?id=1590
from sympy.simplify.fu import *
TR7(TR5(eq)) # which is shorter than expand_sincos_powers(eq)
But if you use it a lot you can make expand_sincos_powers = lambda x:
TR7(TR5(x)) in your personal library of favorite "batteries" that aren't
included. If you wanted it to handle all trig functions you would have to
include the transforms to change everything to cos before applying TR7. I
suppose this could be marked as easy to fix and just have someone write
these little lambda function equivalents.
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