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 - 14.5 Write Trigonometric Functions and Models - 14.5 Exercises - Quiz for Lessons 14.3-14.5 - Page 945: 6


$\cos 2x$

Work Step by Step

Re-arrange the given equation as: $=\dfrac{-\sin x}{\csc x}+\dfrac{\cos x}{\sec x}$ $=\dfrac{-\sin x}{\csc x}+\dfrac{\cos x}{\sec x}$ $=\dfrac{-\sin x}{1/\sin x}+\dfrac{\cos x}{1/\cos x}$ $=-\sin^2 x+\cos^2 x$ $=\cos^2 x-\sin^2 x$ $=\cos 2x$
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.