Trigonometry (10th Edition)

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: 25

Answer

Cosine in second quadrant is negative

Work Step by Step

In II quadrant x is negative and r is always positive, therefore $\frac{x}{r}$ is negative as well.
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