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: 42

Answer

The provided formula is a sum-to-product formula. It states that the addition of two cosines will result in double the product of the two cosines expressions. Thus, this formula can be used to change the sum of two cosines into the product of two cosines expressions.

Work Step by Step

Given above.
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