Comment #14 on issue 2820 by [email protected]: expand() doesn't work in the denominator
http://code.google.com/p/sympy/issues/detail?id=2820
Mul internally uses fraction() to expand the numerator and denominator. This creates (-1 + 1/x)/(x - 2 + 1/x). It then expands this to -1/(x - 2 + 1/x) and 1/x/(x - 2 + 1/x).
So the question is, should _eval_expand_mul work harder to expand this, or should that be the job of expand() itself (issue 3338)?
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