Comment #3 on issue 1963 by smichr: changes to core/power
http://code.google.com/p/sympy/issues/detail?id=1963

I will make those changes.

Regarding the behavior, it's (neg/neg)**x vs (neg/pos)**x. Unless sign simplification is done to change the (neg/neg)**x to (pos/pos)**x one can't break up the numerator and denominator...and as_numer_denom isn't attempting simplification. Perhaps it should at least attempt sign simplification? What do you think?

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