The question is whether the function [cos(pi*x)]^n is periodic with period 1?
I cannot remember how to determine the period of a function. However, I do remember the definition:
f(x+h)=f(x), the h is the period.
I just thought that the period of, for instanse, cosinus was 2Pi. So how can the question be if the period is 1 or not?
Really appreciate the help