Answer
amplitude $2$
period $\pi$
phase shift $\frac{\pi}{4}$
See graph.
Work Step by Step
Step 1. The amplitude can be found as $A=|-2|=2$
Step 2. The period can be found as $p=\frac{2\pi}{2}=\pi$
Step 3. The phase shift can be found as $\frac{\pi/2}{2}=\frac{\pi}{4}$
Step 4. See graph.
