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 - Page 680: 73


$\dfrac {\sqrt {2}}{2}\left( \cos x+\sin x\right) $

Work Step by Step

$\sin \left( \dfrac {\pi }{4}+x\right) =\sin \dfrac {\pi }{4}\cos x+\cos \dfrac {\pi }{4}\sin x=\dfrac {\sqrt {2}}{2}\cos x+\dfrac {\sqrt {2}}{2}\sin x=\dfrac {\sqrt {2}}{2}\left( \cos x+\sin x\right) $
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