Given four coordinates, write a function to check if they form a square on the XY plane.
Bottles of beer
05 - Vector Equations 1
Compare two input matrices
Change the first and last diagonal element of the identity matrix to zero
Ratio between sum of primes and sum of factors
Approximate the inverse tangent by power series
Get the mean digit
Double the next!
Ratio between sum of primer numbers and non-prime numbers
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