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 - Concept and Vocabulary Check - Page 668: 4


Identity for $\sin \left( C-D \right)$ is expressed as $\sin C\cos D-\cos C\sin D$.

Work Step by Step

From the difference formula of sines, the sine of the difference between two angles, say A and B, is expressed as, $\sin \left( A-B \right)=\sin A\cos B-\cos A\sin B$ Thus, for angles C and D, $\sin \left( C-D \right)=\sin C\cos D-\cos C\sin D$
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