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
Is A the inverse of B?
Getting the absolute index from a matrix
Area of an equilateral triangle
Append two matrix as shown below example
Non trivial identities - summation
Probabilities - Balls and urns - 02
Area of polygon
Non trivial identities - flipping
Non trivial identities - reshape
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