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 Test - Page 969: 22

Answer

$-\frac{\sqrt3}{2}$

Work Step by Step

Using the given formula and the known values: $\cos (10\pi/3)=2\sin (5\pi/3)\cos(5\pi/3)=2(-\frac{\sqrt3}{2})(0.5)=-\frac{\sqrt3}{2}$
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