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 - Guided Practice for Examples 1 and 2 - Page 950: 4



Work Step by Step

Using the given formula and the known values: $\cos \pi/12=\cos3\pi/12\cos2\pi/12+\sin3\pi/12\sin2\pi/12=\frac{1}{\sqrt2}\frac{\sqrt3}{2}+\frac{1}{\sqrt2}\frac{1}{2}=\frac{\sqrt3+1}{2\sqrt2}$
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