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
frame of the matrix
Is this number Munchhausen Narcissistic?
Probabilities - Balls and urns - 01
Non trivial identities - reshape
Probabilities - Balls and urns - 02
Remove collinear points in a set of 2D points defining a polygon
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