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