Comment #3 on issue 1993 by [email protected]: make sign simlification part
of canonicalizing process
http://code.google.com/p/sympy/issues/detail?id=1993
Another area where sign simplification would be nice is for expressions like
a(x-y)-a*(y-x)
or
1/(x-y) + 1/(y-x)
It shouldn't take a full simplification to show that those are zero.
Perhaps this should be part of the as_content_primitive routine, robably
through a call to signsimp before doing the content extraction.
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