Answer
$\sqrt3-2$
Work Step by Step
Using the given identities and the known values: $\tan (-15^\circ)=\frac{1-\cos(-30^\circ)}{\sin(-30^\circ)}=\frac{1-\frac{\sqrt3}{2}}{-\frac{1}{2}}=\sqrt3-2$
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: 32
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