Answer
$45^{0}$
Work Step by Step
$x+\theta =90^0\Rightarrow $ if $x=\theta \Rightarrow 2x=90^0\Rightarrow x=45^{0}$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 5 - Trigonometric Functions - 5.1 Angles - 5.1 Exercises - Page 503: 4
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