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: 26

Answer

Sine in third quadrant is negative

Work Step by Step

1. r is always positive 2. y is negative in third quadrant 3. Sine is $\frac{y}{r}= \frac{-}{+}= -$, therefor it is negative
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