Answer
$x=0$
Work Step by Step
So $tan(theta)$ is expressed as y/x. Then we can say that if theta equals $-\pi/2$ then $y=tan(-\pi/2)x$. The slope is undefined and the graph goes through (0,0) so the line is $x=0.$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 8 - Section 8.1 - Polar Coordinates - 8.1 Exercises - Page 593: 53
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