Answer: [tex]\frac{2\pi}{3}[/tex]
Step-by-step explanation:
The period of a function's graph is the distance between two repeating points on the graph. To find the period, we will subtract one of the relative minimums from another directly to the left. See attached for a visual.
[tex]\displaystyle \frac{4\pi}{3} -\frac{2\pi}{3} =\frac{2\pi}{3}[/tex]
