If $\frac{\pi}{2} \leq \theta \leq \pi$ And $\sin \theta=\frac{5}{6}$ , Find the Exact Value of
A)

Essay

If $\frac{\pi}{2} \leq \theta \leq \pi$ and $\sin \theta=\frac{5}{6}$ , find the exact value of
a) $\cos \theta$ .
b) $\cot \theta$ .