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
Number of 1s in the Binary Representation of a Number
sum of first 'n' terms
Is My Wife Wrong?
Find the diagonal of the square of side L
Probabilities - Balls and urns - 01
Remove collinear points in a set of 2D points defining a polygon
Geometrical meaning of determinant
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