Comment #1 on issue 2662 by asmeurer: conjugate(x).diff(x) is wrong http://code.google.com/p/sympy/issues/detail?id=2662
Changing this does indeed prevent some integrals from working, like integrate(conjugate(x), x). We really need to separate the derivative used by the heuristic Risch algorithm and the derivative returned by diff. For example, the derivative of sign(x) is also wrong, but it allows integrating functions with sign(x) in them.
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