Given four coordinates, write a function to check if they form a square on the XY plane.
Inner product of two vectors
Is my wife right?
Basics: 'Find the eigenvalues of given matrix
Length of the hypotenuse
Vectors counting by 2
Sum of a geometric series
Ratio between sum of primer numbers and non-prime numbers
Alternating 1´s and 0´s in a matrix
Approximate the inverse tangent by power series
Say type of roots in quadratic equation
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