## Precalculus (6th Edition)

Published by Pearson

# Chapter 7 - Trigonometric Identities and Equations - 7.4 Double-Angle and Half-Angle Identities - 7.4 Exercises - Page 692: 8

Positive sign

#### Work Step by Step

$\theta =58^{0}\left( Q1;0\leq \theta \leq 90\right)$ Angle is located in quadrant 1 so we should choose positive sign (Cosine is positive in quadrant 1)

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.