Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 7 - Trigonometric Identities and Equations - Summary Exercises Verifying Trigonometric Identities - Exercises: 4

Answer

$sec\left( \pi -x\right) =-secx$

Work Step by Step

$sec\left( \pi -x\right) =\dfrac {1}{\cos \left( \pi -x\right) }=\dfrac {1}{\cos \pi \cos x+\sin \pi \sin x}=-\dfrac {1}{\cos x}=-secx$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.