## Trigonometry 7th Edition

Published by Cengage Learning

# Chapter 2 - Section 2.1 - Definition II: Right Triangle Trigonometry - 2.1 Problem Set: 39

1

#### Work Step by Step

Given expression = $\sin^{2} 60^{\circ} + \cos^{2} 60^{\circ}$ = $( \sin 60^{\circ})^{2} + ( \cos 60^{\circ})^{2}$ = $(\frac{\sqrt 3}{2})^{2} + (\frac{1}{2})^{2}$ ( substituting for exact values of $\sin 60^{\circ}$ and $\cos 60^{\circ})$ =$\frac{3}{4} + \frac{1}{4}$ = $\frac{(3+1)}{4}$ = $\frac{4}{4}$ = 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.