\(\definecolor{frog}{rgb}{1,0,0}\) \(\newcommand{\dx}{\,\text{d}x}\) \(\newcommand{\du}{\,\text{d}u}\) \(\newcommand{\dy}{\,\text{d}y}\) \(\newcommand{\dt}{\,\text{d}t}\)
\(\definecolor{frog}{rgb}{1,0,0}\) \(\newcommand{\dx}{\,\text{d}x}\) \(\newcommand{\du}{\,\text{d}u}\) \(\newcommand{\dy}{\,\text{d}y}\) \(\newcommand{\dt}{\,\text{d}t}\)