Question

Why sin theta and cos theta are periodic functions ? ​

Answer 1

$\huge{\red{\mathtt{\underline{Answer:}}}}$

A period of the function is the horizontal shift in the cycle. Since sin(2nπ + θ) = sin θ, cos(2nπ + θ) = cos θ, for all values of θ and n ϵ N. Therefore, sine and cosine functions are periodic functions.