Answer
In Q3 sine is negative
Work Step by Step
1. r is always positive
2. x is negative in III quadrant
3. Therefore, $\cos\theta=\frac{x}{r}=\frac{-}{+}=-$
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises - Page 26: 30
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