Answer
See graph, domain $\{x|x\ne \frac{2k\pi+\pi}{6}\}$ (k is an integer), range $(-\infty,\infty)$.
Work Step by Step
1. See graph for $y=-2tan(3x)$.
2. We can determine the domain $\{x|x\ne \frac{2k\pi+\pi}{6}\}$ (k is an integer), range $(-\infty,\infty)$.