Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 4 - Section 4.3 - Right Triangle Trigonometry - Exercise Set: 21

Answer

$\cos{83^o}$

Work Step by Step

RECALL: The cofunction Identities: (1) $\sin{\theta} = \cos{(90^o-\theta)}$ (2) $\cos{\theta} = \sin{(90^o-\theta)}$ (3) $\tan{\theta} = \cot{(90^o-\theta)}$ (4) $\cot{\theta} = \tan{(90-\theta^o)}$ (5) $\csc{\theta} = \sec{(90^o-\theta)}$ (6) $\sec{\theta} = \csc{(90^0-\theta)}$ Use identity (1) to obtain: $\sin{7^o} = \cos{(90^o-7^o)} = \cos{83^o}$
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.