Precalculus (6th Edition) Blitzer

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 561: 48



Work Step by Step

Solve. $\cos 12^{\circ} \sin 78^{\circ}+\cos 78^{\circ} \sin 12^{\circ}$ We have $= \sin (90^{\circ}-12^{\circ}) \sin 78^{\circ}+\cos 78^{\circ} \cos 78^{\circ}$ or, $=\sin^2 78^{\circ}+\cos^2 78^{\circ}$ or, $=1$
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