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

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