Answer
See graph, domain $\{x| x\ne 2k+1\}$ (k is an integer), range $\{y|y\le-3\ or\ y\ge3\}$.
Work Step by Step
1. See graph for $y=-3sec(\frac{\pi}{2} x)$.
2. We can identify the domain $\{x| x\ne 2k+1\}$ (k is an integer), range $\{y|y\le-3\ or\ y\ge3\}$.