Updates: Labels: NeedsReview smichr Comment #9 on issue 3322 by smi...@gmail.com: Another CSE bug http://code.google.com/p/sympy/issues/detail?id=3322
There is a fix at 1409 -- the failure of -(-1)**(1/4)*I to combine into -(-1)**(3/4) is reason enough not to tweak as_base_exp. Tests and modified code is available at pull https://github.com/sympy/sympy/pull/1409
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