Updates:
Status: Fixed
Comment #4 on issue 3826 by smi...@gmail.com: trigsimp can't reverse tan
double angle formula
http://code.google.com/p/sympy/issues/detail?id=3826
No, fu is much more robust and slow. trigsimp just uses fu-functions to
mimic what the old trigsimp did previously. In any case, it has been
tweaked to recognize the double angle transformation.
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