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
Increment a number, given its digits
sum of non-primes
Who has power to do everything in this world?
Create a Matrix of Zeros
Matrix of almost all zeros, except for main diagonal
Non trivial identities - summation
Area of polygon
Probabilities - More brains than luck
Non trivial identities - flipping
Non trivial identities - reshape
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