Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 7 - Section 7.1 - Trigonometric Identities - 7.1 Exercises - Page 542: 2

Answer

even

Work Step by Step

For any x it is true that $cos(-x)$ has the same value as $cos (x)$. We express this fact as the identity even.
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