## University Calculus: Early Transcendentals (3rd Edition)

a. Domain: The domain is set of all $(x,y)$ satisfying $x \ne 0$ . b. Range: $R: \dfrac{-\pi}{2} \leq z\leq \dfrac{\pi}{2}$ c. Level Curves: These are the straight lines $y=cx$ (where $c$ is any real number and $x \ne 0$). d. Boundary is the vertical line $x=0$ e. Open f. Unbounded