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.
Sort a list of complex numbers based on far they are from the origin.
Project Euler: Problem 10, Sum of Primes
Celsius to Fahrenheit converter
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