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
Determine if input is odd
Back to basics 15 - Benchmark
Create an array (n,n) where only diagonal elements are '1' and others are '0'
Find the diagonal of the square of side L
Performance - summation
Geometrical meaning of determinant
Probabilities - More brains than luck
Area of polygon
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