Answer
$\frac{3}{4}.$
Work Step by Step
$[f(\theta)]^2=[sin (60^{O})]^2=[sin\frac{\pi}{3}]^2=[\frac{\sqrt3}{2}]^2=\frac{3}{4}.$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 6 - Trigonometric Functions - 6.2 Trigonometric Functions: Unit Circle Approach - 6.2 Assess Your Understanding - Page 379: 99
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