Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 4 - Section 4.2 - Trigonometric Functions: The Unit Circle - Exercise Set - Page 548: 72



Work Step by Step

RECALL: (1) $\sin{(-t)} = -\sin{t}$ (2) $\cos{(-t)} = \cos{t}$ (3) $\tan{(-t)} = -\tan{t}$ Use the given and rule (3) above to obtain: $=-\tan{t} -\tan{t} \\=-c - c \\=-2c$
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