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 - Chapter Review - Page 968: 29



Work Step by Step

Using the given formula and the known values: $\cos(\frac{5\pi}{6})=\cos(\frac{\pi}{2})\cos(\frac{\pi}{3})-\sin(\frac{\pi}{2})\sin(\frac{\pi}{3})=(0)(0.5)-1(\frac{\sqrt3}{2})=-\frac{\sqrt3}{2}$
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