Answer
$-\frac{\sqrt3}{2}$
Work Step by Step
Using the given formula and the known values: $\cos(\frac{5\pi}{6})=\cos(\frac{\pi}{2})\cos(\frac{\pi}{3})-\sin(\frac{\pi}{2})\sin(\frac{\pi}{3})=(0)(0.5)-1(\frac{\sqrt3}{2})=-\frac{\sqrt3}{2}$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
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
Update this answer!
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.
