#### Answer

$$-r$$

#### Work Step by Step

Please note that if $n$ is any integer, the point $(r, \theta )$ can be represented as
$$(r, \theta )= (-r, \theta +\pi + 2n\pi ).$$
We have $n=0$, so the answer is $-r$.

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Published by
Pearson

ISBN 10:
0-13446-914-3

ISBN 13:
978-0-13446-914-0

$$-r$$

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