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