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 all the consonants
Roll the Dice!
Who knows the last digit of pi?
Generate a string like abbcccddddeeeee
Replace multiples of 5 with NaN
Remove collinear points in a set of 2D points defining a polygon
Non trivial identities - flipping
Probabilities - Balls and urns - 01
Performance - summation
Simple polynomial evaluation
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