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

Answer:
option 3 ⇒ π
Step-by-step 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