Given four coordinates, write a function to check if they form a square on the XY plane.
Project Euler: Problem 6, Natural numbers, squares and sums.
Number of odd and even elements within matrix
Matlab Basics II - Count rows in a matrix
Multiply by 3
Get the mean digit
Ratio between sum of primer numbers and non-prime numbers
Approximate the inverse tangent by power series
Ratio between sum of primes and sum of factors
Sum of a geometric series
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