I was looking at this Stack Overflow question:
http://stackoverflow.com/q/1954799/161801

Does anyone know if there's a way to rewrite (-1)**I as exp(-pi) and
I**I as exp(-pi/2) in SymPy?  I thought maybe expand_complex() would
do it, but it doesn't seem to work.  Neither does .rewrite(exp).  The
best I could get was that re() recognizes that I**I is real.

Aaron Meurer

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