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: 3



Work Step by Step

Using the given formula and the known values: $\tan (-15^\circ)=\frac{\tan 45^\circ-\tan 60^\circ}{1+\tan 45^\circ\tan 60}=\frac{1-\sqrt3}{1+1\sqrt3}=\sqrt3-2$
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