Given four coordinates, write a function to check if they form a square on the XY plane.
inner product of two vectors
Basics: 'Find the eigenvalues of given matrix
Swap two numbers
Compare two input matrices
Converting binary to decimals
Ratio between sum of primes and sum of factors
Ratio between sum of primer numbers and non-prime numbers
Get the mean digit
Double the next!
Approximate the inverse tangent by power series
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