Updates:
Cc: smi...@gmail.com
Comment #3 on issue 2552 by asmeurer: (1/(x*y)).subs(x*y, whatever) doesn't
work
http://code.google.com/p/sympy/issues/detail?id=2552
This is nontrivial to fix, btw, because Pow(a, e)*Pow(b, e) != Pow(a*b, e)
in general (that's why I had to set x and y to be positive above). The
rules should all be there in Mul._eval_power, though. I don't remember how
complicated they are, but if they are complicated, perhaps they should be
factored out into a helper function.
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