Comment #3 on issue 2081 by rosen.diankov: Pow substitution introduces wrong answers
http://code.google.com/p/sympy/issues/detail?id=2081
this substitution does not hold for all values of x and thus leads to really hard-to-reproduce bugs.
i'm using sympy for a serious application where users cannot afford to deal with such problems, the fix is also simple (just add the above condition).
unless the sympy variables directly reflect the range in which the expression is valid in, i don't see any reason why there should be a switch to turn this on...
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