Comment #21 on issue 2624 by [email protected]: Sympy 0.7.1 can't integrate Gaussians
http://code.google.com/p/sympy/issues/detail?id=2624
I'm not sure if expand_mul() is the best simplification to use here. In general, that will make things less simple, as it will unfactorize things.
Perhaps a better solution would be something like together(). This also simplifies this expression, and it's cheap. I'm not sure if it will work in the more general setting, though.
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