Give the sum of the first 'n' terms of a geometric series, given 'a' as the first term and 'r' as the ratio.
Doubling elements in a vector
Finding perimeter of a rectangle
Summation of array
Create sine function out of cosine
Alternating 1´s and 0´s in a matrix
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
Say type of roots in quadratic equation
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