#### Answer

$\pm \sqrt {2}$

#### Work Step by Step

$r^{2}=4\sin 2\theta \Rightarrow r^{2}=4\sin \left( 2\times 15\right) =4\times \sin 30=2\Rightarrow r=\pm \sqrt {2}$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$\pm \sqrt {2}$

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