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
Convert Two Character String into a Binary Vector
find the roots of a quadratic equation
Sum of diagonals elements of a matrix
Append two matrix as shown below example
Probabilities - Balls and urns - 01
Non trivial identities - flipping
Probabilities - More brains than luck
Area of polygon
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