#### 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.

Published by
Pearson

ISBN 10:
978-0-13-421743-7

ISBN 13:
978-0-13421-743-7

$-r$

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