Updates:
Cc: mattpap
Labels: smichr
Comment #73 on issue 966 by asmeurer: Can't simplify exp(2 * pi * I * a)
when a is integer
http://code.google.com/p/sympy/issues/detail?id=966
This should be expanded to make exp(I*pi*rational_number) work (i.e.,
return the root of unity). Most of this should already be implemented in
the cyclotomic polynomials. Mateusz would probably know the best way to
convert from one form to the other.
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