Answer
$$1$$
Work Step by Step
$$\sec r\cos r$$
Rewrite $\sec r$ using Reciprocal Identities
$$\frac{1}{\cos r}\times\cos r$$
$$= 1$$
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 5 - Trigonometric Identities - Section 5.2 Verifying Trigonometric Identities - 5.2 Exercises - Page 202: 25
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