#### Answer

$\cot^2t$

#### Work Step by Step

Use the identity on page 655, $1+\cot^2 t=\csc^2 t$, and subtract $1$ from both sides:
$\cot^2 t=\csc^2t-1$
So $\csc^2t-1=\cot^2t$.

Published by
Pearson

ISBN 10:
013421742X

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

$\cot^2t$

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