Comment #6 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
It's not excruciatingly slow...this can be tested by changing futrig to fu
in the trigsimpfunc dictionary. One thing we could do is make fu the
default and hook futrig to a "quick" method (trigsimp(expr, method=quick)).
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