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
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Reverse the vector
Bottles of beer
Simple polynomial evaluation
Non trivial identities - reshape
A shooting competition
Geometrical meaning of determinant
Performance - summation
Find the diagonal of the square of side L
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