Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 7 - 7.2 - Verifying Trigonometric Identities - 7.2 Exercises - Page 520: 25

Answer

The identity is verified. See the graph of $f(y)=sec~y~cos~y$
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Work Step by Step

$sec~y~cos~y=\frac{1}{cos~y}·cos~y=1$
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