Answer
$-r$
Work Step by Step
Alternatively, the graph of $r = f(\theta)$ is symmetric with respect to the pole if substitution of $-r$ for $r$ leads to an equivalent equation.
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 8 - Complex Numbers, Polar Equations, and Parametric Equations - Section 8.5 Polar Equations and Graphs - 8.5 Exercises - Page 396: 74d
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