CPM Homework Help : PC3 Problem 2-113

Graph two complete cycles of each of the following functions

$f(x)=\cos(4x)$
Hint (a):
This is a cosine graph with a period of $\frac{2\pi}{4}$ .

$g(x)=\sin\left(\frac{\pi}{3}x\right)$
Hint (b):
The period of this function is: $\frac{2\pi}{\pi/3}$