Updates:
Status: Invalid
Comment #1 on issue 1494 by [email protected]: eq.subs fails for
Derivative(u(t)**2, t**2)
http://code.google.com/p/sympy/issues/detail?id=1494
t**2 is not a valid variable to differentiate with respect to, as the
message says. I think this is not a bug, since differentiating wrt
expressions is not well-defined, so we should not implement it.
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