# Chapter 7 - Trigonometric Identities and Equations - 7.1 Fundamental Identities - 7.1 Exercises - Page 658: 10

$\dfrac {2}{3}$

#### Work Step by Step

$-\sin \left( -\theta \right) =-\left( -\sin \theta \right) =\sin \theta =\dfrac {2}{3}$ ($sine$ is an odd function)

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