Question

What period of the functions f(x) = cos 2x? Please help thank you.

Answer 1

option 3 ⇒ π

Explanation:

The general equation of the given function is as following

f(x) = A cos (Bx)

Where A is the amplitude

and B = 2π/period

For the given function f(x) = cos 2x

B = 2

period = 2π/B = 2π/2 = π