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: 25


$\cos \theta-1$

Work Step by Step

Here, $-\dfrac{\tan (\theta/2)}{\csc \theta}=-\tan (\theta/2) \sin \theta$ or $=-\dfrac{\sin (\theta/2)}{\cos \theta/2} \times [2 \sin (\theta/2) \cos (\theta/2)]$ or, $=-2 \sin^2 (\theta/2)$ or, $=-1+1 -2 \sin^2 (\theta/2)$ or, $=-1+\cos [2 (\theta/2)]$ or, $=\cos \theta-1$
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.