Answer
See below.
Work Step by Step
In a right angled triangle, the acute angles are complements.
Thus, $\sin (90^{\circ}-\theta) =\cos \theta $
So, the sine of one acute angle is equal to the cosine of the other acute angle.
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 4.3 - Right Triangle Trigonometry - Exercise Set - Page 562: 65
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