Answer
The trigonometric Identity is verified.
$cos^2β-sin^2β=2~cos^2β-1$
Work Step by Step
$sin^2β+cos^2β=1~~$ (Pythagoren Identity)
$cos^2β-1=-sin^2β$
Now:
$cos^2β-sin^2β=cos^2β+cos^2β-1=2~cos^2β-1$
Algebra and Trigonometry 10th Edition
by Larson, Ron
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: 12
Update this answer!
You can help us out by revising, improving and updating this answer.
Update this answerAfter 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.
