Comment #6 on issue 2327 by [email protected]: sqrt(I) should return
sqrt(2)/2 + sqrt(2)/2*I by default
http://code.google.com/p/sympy/issues/detail?id=2327
This operation is related with simplification and complex expansion.
The original expression save information about multiplicity of solutions,
while simplified expression only about principal root.
http://en.wikipedia.org/wiki/Square_root#Square_root_of_an_imaginary_number
So I am -1, that is contra, to simplify on-the fly such simplification
rules.
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