Precalculus (6th Edition)

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

Chapter 7 - Trigonometric Identities and Equations - Quiz - Page 683: 4


$-\cos \theta $

Work Step by Step

$\cos \left( 180-\theta \right) =\cos {180}\cos \theta +\sin {180}\sin \theta =-1\times \cos \theta +0\times \sin \theta =-\cos \theta $
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.