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
Most nonzero elements in row
First N Perfect Squares
Bottles of beer
Solve the set of simultaneous linear equations
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Non trivial identities - summation
Remove collinear points in a set of 2D points defining a polygon
Geometrical meaning of determinant
Probabilities - More brains than luck
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