#### Answer

$r' = \theta cos\theta$

#### Work Step by Step

$r = \theta sin\theta + cos\theta$
$r' = sin\theta + \theta cos\theta - sin\theta=\theta cos\theta$

Published by
Pearson

ISBN 10:
0321999584

ISBN 13:
978-0-32199-958-0

$r' = \theta cos\theta$

$r = \theta sin\theta + cos\theta$
$r' = sin\theta + \theta cos\theta - sin\theta=\theta cos\theta$

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