Answer
See graph, domain $\{x|x\ne k\pi \}$ (where $k$ is an integer), range $(-\infty,-3]U[3,\infty)$.
Work Step by Step
Step 1. See graph for $y=-3csc(x)$.
Step 2. Based on the graph, we can determine the domain $\{x|x\ne k\pi \}$ (where $k$ is an integer), range $(-\infty,-3]U[3,\infty)$.