Comment #8 on issue 3710 by [email protected]: shallow expansion feature/bug
http://code.google.com/p/sympy/issues/detail?id=3710
This is the intended expansion in the codebase when expand_mul is used.
Since deep is automatically True, this also recurses through the entire
tree making changes that won't be processed at the level that a
simplification routine is likely working at. e.g. if I want to extract the
gcd from an expression, I would flatten it, leaving contents of cos, for
example, alone since the interior won't leak out, and then run over the
factors of each term looking for gcds.
Imagine using expand_mul(deep=True) in a bottom up simplification: every
time it gets used it drills down through the already expanded tree when all
that is actually needed is to flatten the current level wrt Add and Mul.
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