# What is the period of f(t)=cos ( ( 4 t ) / 3 ) ?

$\frac{3 \pi}{2}$
Period of$f \left(t\right) = \cos \left(\frac{4 t}{3}\right)$ --> $\left(3\right) \frac{2 \pi}{4} = \frac{3 \pi}{2}$