Given an input vector containing a cosine wave of unknown frequency, produce an output vector of the same length containing a cosine wave of twice the input frequency. The output should have the same mean and amplitude as the input.
Clever use of acos(). I didn't think to do that.
Given two strings, find the maximum overlap
Back to basics 8 - Matrix Diagonals
Is X a Fibonacci Matrix?
Return area of square
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