Precalculus (6th Edition) Blitzer

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

Chapter 5 - Section 5.2 - Sum and Difference Formulas - Exercise Set - Page 671: 82

Answer

The formula in the form of words is: the cosine sum of two angles is equal to the product of the cosine of the first angle and the cosine of the second angle minus the product of the sine of the first angle and the sine of the second angle.

Work Step by Step

Given above.
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