Updates:
Status: Invalid
Comment #1 on issue 2447 by asmeurer: ((-1)**Rational(1,3)).evalf() returns
wrong result
http://code.google.com/p/sympy/issues/detail?id=2447
That isn't wrong. See http://www.wolframalpha.com/input/?i=(-1)**(1/3) (it
agrees to all the digits that SymPy gives).
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