Comment #12 on issue 2802 by asmeu...@gmail.com: solve error with expression with derivative
http://code.google.com/p/sympy/issues/detail?id=2802
This sounds a little shaky. I think in Maple, you can solve for non-symbols, but it prints a warning when you do telling you that it's a bad idea.
What exactly is the rule here to determine if an expression is part of the expression being solved for or not? Does it just use something like expr.subs(x**2, y) and then solve for y?
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