Suppose $-\frac{\pi}{2}<\theta<0$ And $\sin (\theta)=-\frac{3}{4}$ Evaluate:
A) Cos

Suppose $-\frac{\pi}{2}<\theta<0$ and $\sin (\theta)=-\frac{3}{4}$ . Evaluate:
A) cos( $\theta$ )
B) tan( $\theta$ )
Give the exact answers.