Answer
domain $\{x|x\ne k\pi+\frac{\pi}{2}\}$ (k is an integer), range $\{y|y\le-1\ or\ y\ge1\}$, period$=2\pi$.
Work Step by Step
For $y=sec(x)$, we can find the domain $\{x|x\ne k\pi+\frac{\pi}{2}\}$ (k is an integer), range $\{y|y\le-1\ or\ y\ge1\}$, period$=2\pi$.
