Answer
amplitude$=\frac{3}{2}$, period$= \frac{\pi}{3}$, phase shift$= -\frac{\pi}{2}$ See graph.
Work Step by Step
1. Given $y=\frac{3}{2}cos(6x+3\pi)$, we can identify its amplitude$=\frac{3}{2}$, period$=\frac{2\pi}{6}=\frac{\pi}{3}$, phase shift$=-\frac{3\pi}{6}=-\frac{\pi}{2}$
2. See graph.
