Answer
$(-\infty,\infty)$, $(-\frac{\pi}{2}, \frac{\pi}{2})$.
Work Step by Step
The domain and range of $y=tan^{-1}(x)$ will be the range and a restricted domain of $y=tan(x)$. Thus the answers are: domain $(-\infty,\infty)$ and range $(-\frac{\pi}{2}, \frac{\pi}{2})$.
