Comment #5 on issue 3300 by [email protected]: simplify should call doit() on Subs instances
http://code.google.com/p/sympy/issues/detail?id=3300

https://github.com/sympy/sympy/pull/2936

simplify is calling doit in every instance in this PR. So the expression

simplify(x0*Derivative(f(x0, y0), y0) - x0*Subs(Derivative(f(x0, _xi_2), _xi_2), (_xi_2,), (y0,)))
returns 0 as it should without explicitly calling for doit()


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