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Final answer:In mathematics, the Euclidian algorithm is used to calculate the greatest common denominator of two numbers by performing divisions until reaching a zero remainder.Explanation:The topic of greatest common factor (GCF) falls under mathematics, specifically in algebra. The Euclidian algorithm is a method used for finding the greatest common denominator (GCD) of two numbers, which is the largest number that divides both without leaving a remainder. When you are given a function f(x) with a known period and you need to find the GCD involving the period and another number, you apply this algorithm iteratively by dividing and obtaining remainders until you reach a zero remainder. The last non-zero remainder is then the GCD. In the context of GridWords: Factoring, the student is asked to calculate the GCD of two functions related to the given period, 'a', and the number 'N' which needs to be factored....