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.
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Matrix indexing with two vectors of indices
Spot the outlier
Derivative of polynomial
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