Answer
See graph and explanations.
Work Step by Step
1. Rewrite the function as $y=3sec(\frac{\pi}{2}x)=\frac{3}{cos(\frac{\pi}{2}x)}$, we have $p=\frac{2\pi}{\frac{\pi}{2}}=4$.
2. Graph $y=3cos(\frac{\pi}{2}x)$ (blue), use the reciprocal property to get $y=3sec(\frac{\pi}{2}x)$ (red).
