Comment #5 on issue 216 by ronan.l...@gmail.com: (-1)**Rational(1,3) could  
be automatically rewritten using I
http://code.google.com/p/sympy/issues/detail?id=216

This is still XFAILing, but I don't think that this should be evaluated  
automatically.
On the other hand, im((-1)**Rational(1,3)) should return
Rational(1,2)*3**Rational(1,2) and applying some function (such as simplify  
or expand
or ...) should return the expanded form.

There is also a problem in the inconsistency between the square root and  
n-th roots, n>2.


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