Suppose $-\frac{\pi}{2}<\theta<0$ And $\tan (\theta)=-\frac{5}{6}$ Evaluate:
A) Sin

Suppose $-\frac{\pi}{2}<\theta<0$ and $\tan (\theta)=-\frac{5}{6}$ . Evaluate:
A) sin( $\theta$ )
B) cos( $\theta$ )
Give the exact answers.