Updates:
Status: Invalid
Comment #1 on issue 3340 by [email protected]: wrong result in simple
symbolic calculation
http://code.google.com/p/sympy/issues/detail?id=3340
Please see
http://docs.sympy.org/0.7.1/gotchas.html#python-numbers-vs-sympy-numbers
What you're seeing is just a consequence of the fact that in Python -3/2 ==
-2 and 3/2 == 1. You should use something like S(3)/2 instead.
We know it's confusing, but there's nothing we can do about it inside sympy.
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