Answer
Refer answer below.
Work Step by Step
a. Domain : A set of all $(x,y)$ when $x \ne 0$ .
b. Range: The range is $\dfrac{-\pi}{2} \leq z\leq \dfrac{\pi}{2}$
c. The level curves are the straight lines whose the form of $y=cx$ for any real number when $x \ne 0$.
d. Boundary points refers to a straight line when $x=0$
e. Open
f. Unbounded
