Comment #2 on issue 3338 by smi...@gmail.com: API for expand methods to go all the way
http://code.google.com/p/sympy/issues/detail?id=3338

So maybe a heuristic dictionary with entries like

(func, arg_func): hints to expand fully

could be used, e.g.

(lambda x: isinstance(x, (sin, cos)), lambda x: x.is_Mul): mul, trig
(lambda x: x.is_Mul, lambda x: any(xi.is_Add for xi in x.args)): mul


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