Updates:
Status: WontFix
Comment #1 on issue 3491 by [email protected]: simpler powsimp for products
containing (-1)**(a/q)*n**(b/q)
http://code.google.com/p/sympy/issues/detail?id=3491
Mul only removes an I if the power of -1 is an odd multiple of 1/2; since
(-1)**(3/4) is already imaginary, there's not point in creating 2 imaginary
terms as in `a`.
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