Answer
Negative sign
Work Step by Step
$\theta =195\left( Q3;180 < \theta < 270\right) $
So if angle is in quadrant 3 we should choose negative sign
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 7 - Trigonometric Identities and Equations - 7.4 Double-Angle and Half-Angle Identities - 7.4 Exercises - Page 692: 7
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