Answer
$\frac{cos~x-2}{cos^2x-4}=\frac{1}{cos~x+2}$
Work Step by Step
$\frac{cos~x-2}{cos^2x-4}=\frac{cos~x-2}{cos^2x-2^2}=\frac{cos~x-2}{(cos~x+2)(cos~x-2)}=\frac{1}{cos~x+2}$
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: 24
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