Answer
$\theta = 90^{\circ}$
Work Step by Step
$sin^2~\theta = -cos~2\theta$
$sin^2~\theta = -(cos^2~\theta-sin^2~\theta)$
$cos^2~\theta = 0$
$cos~\theta = 0$
$\theta = 90^{\circ}$
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 6 - Test - Page 287: 15
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