Is f(x) = cos^2(x) + sin^2(x) a periodic function?
sin^2(x) + cos^2(x) = 1
The Attempt at a Solution
This question is just something that randomly came to my mind (not a hw problem). I know cos^2(x) and sin^2(x) are both periodic functions, but is sin^2(x) + cos^2(x) a periodic function too? If so, what would be its fundamental frequency?