Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises - Page 28: 32


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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