Comment #2 on issue 3316 by [email protected]: Expr.expand: the result depends on the order in which hints are traversed.
http://code.google.com/p/sympy/issues/detail?id=3316
I think at the very least we should keep multinomial before mul for efficiency purposes, due to the common case of expressions like x*(x + 1)**2.
See also issue 3338. If we can be smart about knowing when to try expanding again, I think we should be (that issue also allows third-party expand methods to do their thing, even a for method that potentially isn't idempotent).
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