# Chapter 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises: 76

$\sin (-900)^{\circ}=0$

#### Work Step by Step

1. What we know about -900 degree angle $\theta=180^{\circ}$ (because it is a co-terminal angle and values of x and y will be the same) $x=-1$ $y=0$ $r=1$ 2. Substitute in: $\sin\theta=\frac{y}{r}=\frac{0}{1}=-0$

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