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 (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 5 - Trigonometric Identities - Section 5.2 Verifying Trigonometric Identities - 5.2 Exercises - Page 208: 35
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