Comment #4 on issue 3145 by pr...@goodok.ru: simultaneous substitution http://code.google.com/p/sympy/issues/detail?id=3145
Upon XFAIL I meant `(sqrt(a/b)).subs([(a,0),(b,0)]) <> (sqrt(a/b)).subs(reversed([(a,0),(b,0)]))`
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