# 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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