Comment #3 on issue 2664 by julien.r...@gmail.com: sign(x) should reduce to x/abs(x) when x is known to not be 0
http://code.google.com/p/sympy/issues/detail?id=2664
In https://github.com/sympy/sympy/pull/1271 sign(x).doit() reduces to x/Abs(x).
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