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
The Goldbach Conjecture, Part 2
Sum the entries of each column of a matrix which satisfy a logical condition.
Is it a number?
Square root of a number
Remove collinear points in a set of 2D points defining a polygon
Area of polygon
Non trivial identities - reshape
Geometrical meaning of determinant
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