Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 5 - Section 5.4 - Product-to-Sum and Sum-to-Product Formulas - Exercise Set - Page 690: 47

Answer

The graphs appear to coincide.
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Work Step by Step

$$\sin 3x + \sin x = 2 \sin \frac{3x+x}{2}\cos \frac{3x-x}{2}=2\sin 2x \cos x$$
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