Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 14 Trigonometric Graphs, Identities, and Equations - 14.7 Apply Double-Angle and Half-Angle Formulas - 14.7 Exercises - Skill Practice - Page 960: 28


$1-\tan^2 x$

Work Step by Step

Here, we have $\cos^2 x-\sin^2 x \ne 1$ Use the correct identity $\sin^2 x +\cos^2 x = 1$ or, $=1-\dfrac{\sin^2 x}{\cos^2 x}$ or, $=1-\tan^2 x$
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.