I'm confused by this problem. It requires the use of diff() and asks for differentiation, but it tests for equality with the input variable...
the author had proposed lots of questions with meaningless test. i despise this behavior
I understood this set of problems. The author wants us to use a function on x and then recover the original x (therefore an identity). However, It would be probably better if the test suite gave us the modified x (with additional necessary parameters) and demanded the original. That goes for all his problems of this kind.
Gareth, my guess is that he is not doing this on purpose, he only needs to improve his test suite. Currently it is very easy to give a phony solution.
For instance a better problem description would be return the ORIGINAL x after differentiating it.
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