Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium Integration

New issue 4044 by [email protected]: Avoid NotImplementedError: Cannot work with non-rational coefficients in this case. in risch_integrate()
http://code.google.com/p/sympy/issues/detail?id=4044

Sometimes risch_integrate gives NotImplementedError: Cannot work with non-rational coefficients in this case. This is because internally, it can't determine if some symbolic value is rational or not. I think it should just assume that it isn't. A simple example is risch_integrate(exp(I*x)*exp(k*I*x), x).

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