TeX source:

\frac{\mathbf{d}}{\mathrm{dx}}\left(\sqrt{2 \mathrm{x}+3 \mathrm{x}^{5}}\right)=\frac{\mathbf{d}}{\mathbf{d x}}\left(\left(2 \mathrm{x}+3 \mathrm{x}^{5}\right)^{1 / 2}\right)