Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 7 - Trigonometric Identities and Equations - 7.3 Sum and Difference Identities - 7.3 Exercises: 58

Answer

$1$

Work Step by Step

$\sin 40\cos 50+\cos 40\sin 50=\sin \left( 40+50\right) =\sin 90=1$
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