Given four coordinates, write a function to check if they form a square on the XY plane.
Make one big string out of two smaller strings
Rotate input square matrix 90 degrees CCW without rot90
Equal to their cube
select the primes of a vector
Find the sum of n squares
Ratio between sum of primes and sum of factors
Ratio between sum of primer numbers and non-prime numbers
Approximate the inverse tangent by power series
Alternating 1´s and 0´s in a matrix
Say type of roots in quadratic equation
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