Answer
$\pi-\theta$
Work Step by Step
The line $\theta=\frac{\pi}{2}$ is similar to the $+y$-axis, replacing $\theta$ with $\pi-\theta$ can be used to test the symmetry with respect to that line.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 8 - Polar Coordinates; Vectors - Section 8.2 Polar Equations and Graphs - 8.2 Assess Your Understanding - Page 605: 10
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