Return x by differentiating it.
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
Remove NaN ?
Say something funny
04 - Scalar Equations 1
Non trivial identities - reshape
Non trivial identities - summation
Probabilities - More brains than luck
Simple polynomial evaluation
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