Question

What is the period of `f(t)=cos 2 t`?

Answer 1

`pi`

Explanation:

The period of `cos(x)` is `2pi`, thus the period of `cos(2t)` is the change needed in `t` for `2t` to change by `2pi`. So

`2t = 2pi => t = pi`.

Thus the period is `pi`.