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
Test for balanced parentheses
Back to basics 8 - Matrix Diagonals
Who knows the last digit of pi?
A shooting competition
Performance - summation
Area of polygon
Probabilities - Balls and urns - 01
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