Precalculus (6th Edition)

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

Chapter 7 - Trigonometric Identities and Equations - 7.1 Fundamental Identities - 7.1 Exercises - Page 658: 7

Answer

$-0.65$

Work Step by Step

$\cos \left( -\theta \right) =\cos \left( \theta \right) =-0.65$ (Becouse cosine is even function )
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