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: 31

Answer

In Q4 cosine is positive

Work Step by Step

1. r is always positive 2. x is positive 3. Therefore, $\cos\theta=\frac{x}{r}=\frac{+}{+}=+$
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