Comment #23 on issue 1620 by renato.c...@gmail.com: Allow derivatives of
unknown functions evaluated at a point
http://code.google.com/p/sympy/issues/detail?id=1620
I implemented an Eval class (not sure about the name, though):
https://github.com/renatocoutinho/sympy/commit/5f0dcca5727dc28b28c8cef94d5e818f73a17402
Things are looking good now. If you are +1, I'll add tests and create a
pull request.
It would be great to have pretty_print for this also, but I would need some
guiding there, I never played with it before and it looks a bit confusing.
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