Determine Whether the Improper Integral Converges or Diverges, and If $\int_{\pi / 2}^{5 \pi / 6} \frac{\cos x}{\sqrt{1-\sin x}} d x$

Determine whether the improper integral converges or diverges, and if it converges, find its value. $\int_{\pi / 2}^{5 \pi / 6} \frac{\cos x}{\sqrt{1-\sin x}} d x$