Given four coordinates, write a function to check if they form a square on the XY plane.
Find the sum of all the numbers of the input vector
Remove the vowels
Replace NaNs with the number that appears to its left in the row.
Calculate the area of a triangle between three points
Simple equation: Annual salary
Ratio between sum of primes and sum of factors
Get the value 100
Say type of roots in quadratic equation
Ratio between sum of primer numbers and non-prime numbers
Approximate the inverse tangent by power series
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