What is the length of 1 period in the function

SOLUTION
[tex]\begin{gathered} \text{Frequency is given as } \\ f=\frac{2\pi}{T},\text{ where T is the period and f the frequency } \\ \text{here, the frequency is 2} \\ 2=\frac{2\pi}{T} \\ 2T=2\pi \\ T\text{ =}\pi \end{gathered}[/tex]