Answer
1
Work Step by Step
$sin^{2}x$ + $cos^{2}x$ =1 for all x
so for x = $\frac{\pi}{6}$,
$sin^{2}\frac{\pi}{6}$ + $cos^{2}\frac{\pi}{6}$ =1.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.2 - Trigonometric Functions: The Unit Circle - Exercise Set - Page 548: 35
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