TeX source:

\mathbf{D}\left(\frac{5}{\sqrt{2+\sin (\mathrm{x})}}\right)=5\left(\frac{-1}{2}\right)(2+\sin (\mathrm{x}))^{-3 / 2} \cos (\mathrm{x})=\frac{-5 \cos (\mathrm{x})}{2(2+\sin (\mathrm{x}))^{3 / 2}}