Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 2 - Acute Angles and Right Triangles - Section 2.2 Trigonometric Functions of Non-Acute Angles - 2.2 Exercises - Page 63: 65


$\theta = 45^{\circ}$ or $315^{\circ}$

Work Step by Step

1. Since $cos\theta$ is positive, $\theta$ must be in quadrant I or IV. 2. The reference angles is $45^{\circ}$. The other angle in IV quadrant must be : $360^{\circ}-45^{\circ}=315^{\circ}$
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.