Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 14 Trigonometric Graphs, Identities, and Equations - 14.6 Apply Sum and Difference Formulas - 14.6 Exercises - Skill Practice - Page 952: 30

Answer

$$-\sin \left(x\right)$$

Work Step by Step

Simplifying the expression using the sum and difference formulas, we find: $$\cos \left(x\right)\cos \left(\frac{5\pi }{2}\right)-\sin \left(x\right)\sin \left(\frac{5\pi }{2}\right)\\ -\sin \left(x\right)$$
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