#### Answer

$\cos^2\theta$

#### Work Step by Step

$\sin^2\theta(\csc^2\theta-1)$
$=\sin^2\theta*\cot^2\theta$
$=\sin^2\theta*\frac{\cos^2\theta}{\sin^2\theta}$
$=\cos^2\theta$

Published by
Pearson

ISBN 10:
013421742X

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

$\cos^2\theta$

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