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: 21

Answer

The identity is verified. $\frac{1+sin~\theta}{cos~\theta}+\frac{cos~\theta}{1+sin~\theta}=2~sec~\theta$

Work Step by Step

$\frac{1+sin~\theta}{cos~\theta}+\frac{cos~\theta}{1+sin~\theta}=\frac{1+sin~\theta}{cos~\theta}\frac{1+sin~\theta}{1+sin~\theta}+\frac{cos~\theta}{1+sin~\theta}\frac{cos~\theta}{cos~\theta}=\frac{1+2~sin~\theta+sin^2\theta+cos^2\theta}{(1+sin~\theta)cos~\theta}=\frac{2+2~sin~\theta}{(1+sin~\theta)cos~\theta}=\frac{2(1+sin~\theta)}{(1+sin~\theta)cos~\theta}=2\frac{1}{cos~\theta}=2~sec~\theta$
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