Suppose $\frac{\pi}{2}<\theta<\pi$ And $\sin (\theta)=\frac{1}{2}$ Evaluate:
A) Cos

Suppose $\frac{\pi}{2}<\theta<\pi$ and $\sin (\theta)=\frac{1}{2}$ . Evaluate:
A) cos( $\theta$ )
B) tan( $\theta$ )
Give the exact answers.