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 521: 70


The correct use of the Pythagorean Identity: $1+tan^2\theta=sec^2~\theta$ If $\theta=60°$: $1+tan~60°=1+\sqrt 3\ne sec~60°=2$

Work Step by Step

$1+tan~\theta=1+\frac{sin~\theta}{cos~\theta}=\frac{cos~\theta+sin~\theta}{cos~\theta}\ne sec~\theta=\frac{1}{cos~\theta}$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.