# How do you find the amplitude and period of a function y=cos(θ/4)?

Find amplitude and period of $y = \cos \left(\frac{x}{4}\right)$
Period of cos x is $2 \pi$, then the period of $\cos \left(\frac{x}{4}\right)$ is
$4 \left(2 \pi\right) = 8 \pi$.