Give the sum of the first 'n' terms of a geometric series, given 'a' as the first term and 'r' as the ratio.
Find out value of sine given by degree.
y equals x divided by 2
Divide by 4
Find the sum of n squares
Alternate list of elements
Ratio between sum of primes and sum of factors
Double the next!
Say type of roots in quadratic equation
Check if is a square
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