Updates:
Status: WontFix
Comment #11 on issue 3710 by [email protected]: shallow expansion feature/bug
http://code.google.com/p/sympy/issues/detail?id=3710
Closing as won't fix. If you do a shallow expansion wrt Mul, you may have
factors in terms that will be the same if the expansion were done deeply so
you might as well do the deep expansion.
But this can be tricked into expanding terms of an Add as follows:
eq=x+x*(y+1)
expand_mul(eq, deep=0)
x*(y + 1) + x
expand_mul(Mul(2,eq,evaluate=0), deep=0)/2
x*y + 2*x
or
kern=Dummy(); expand_mul(eq*kern, deep=0).xreplace({kern:1})
x*y + 2*x
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