Chapter 6.3, Problem 88E

DISCUSS: Periodic Functions I Recall that a function $f$ is periodic if there is a positive number $p$ such that $f\left(t+p\right)=f\left(t\right)$ for every $t$, and the least such $p$ (if it exists) is the period of $f$. The graph of a function of period $p$ looks the same on each interval of length $p$, so we can easily determine the period from the graph. Determine whether the function whose graph is shown is periodic; if it is periodic, find the period.