Comment #2 on issue 3907 by asmeu...@gmail.com: constantsimp(C0*C1*x + C1**2,x,2) should simplify things!
http://code.google.com/p/sympy/issues/detail?id=3907

Actually, this is something that I did not consider in that issue (are there any solvers from dsolve currently that can return something like this?). I think that this transformation is actually OK, just as C1**2 -> C1 is OK, (C1*C2, C2**2) -> (C1, C2) should be OK. The issue is things like (C1, C1**2) -> (C1, C2). Basically, if you start with n linearly independent constants, you should also end with n linearly independent constants.

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