Answer
$sec~x~cos~x=1$
(c)
Work Step by Step
We know that: $sec~x=\frac{1}{cos~x}$
$sec~x~cos~x=\frac{1}{cos~x}cos~x=1$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 7 - 7.1 - Using Fundamental Identities - 7.1 Exercises - Page 513: 13
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