TeX source:

\mathrm{D}\left(\ln \left(\mathrm{x}^{2}+3\right)\right)=\frac{\mathrm{g}^{\prime}(\mathrm{x})}{\mathrm{g}(\mathrm{x})}=\frac{2 \mathrm{x}}{\mathrm{x}^{2}+3}