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There are two functions:
T=2π is the fundamental period of (2) function.
T1 is the fundamental period of (1) function.
How to prove that T1=2π/n?
By definition, a function f(.) is periodic with period p if f(x+p) = f(x) and p is the smallest positive number that satisfies the above relation.
Hence the period p=2π/n
The answer will be 2π/n...