periodic function
A function that repeats the same value at regular intervals of the variable.

A function f(x) is periodic if there exists such a number p that can make f(x+p) = f(x) for all x. The smallest p is called the period. For example, y = sin(x) is a periodic function with a period of 2symbol PI because 2symbol PI is the smallest number p that makes sin(x+p) = sin(x) for all x.

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