Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 3 - Section 3.1 - Reference Angle - 3.1 Problem Set - Page 122: 51

Answer

$\sin (- 120)^{\circ}$ = - 0.8660

Work Step by Step

Using calculator in degree mode- (- 120) → $\sin$ $\sin (- 120)^{\circ}$ = - 0.8660254038 Rounding it to four places past the decimal point- $\sin (- 120)^{\circ}$ = - 0.8660
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