Status: Accepted
Owner: smichr
Labels: Type-Defect Priority-Medium

New issue 1986 by smichr: cse eats derivatives
http://code.google.com/p/sympy/issues/detail?id=1986

f(x).diff(x)+sqrt(1-f(x))+3/(1-f(x))
D(f(x), x) + (1 - f(x))**(1/2) + 3/(1 - f(x))
cse(_)
([(x0, f(x)), (x1, 1 - x0)], [x1**(1/2) + 3/x1])

When f(x) is replaced with x0, D(x0,x) -> 0 and is lost.

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