Updates:
Status: Duplicate
Mergedinto: 1660
Comment #5 on issue 2197 by asmeurer: differentiate in nested functions
http://code.google.com/p/sympy/issues/detail?id=2197
Hi.
This is indeed already a known issue (issue 1660). You are trying to take
the derivative with respect to z + L, which is not allowed. The problem
also comes when SymPy tries to apply the chain rule to expressions.
The solution would require SymPy to be able to represent the derivative
evaluated at a point (see issue 1620).
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