#### Answer

$sec\theta $

#### Work Step by Step

$sec\left( -\theta \right) =\dfrac {1}{\cos \left( -\theta \right) }=\dfrac {1}{\cos \theta }=sec\theta $
( Becouse cosine is even function)

Published by
Pearson

ISBN 10:
013421742X

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

$sec\theta $

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