How can continue the equation of the rectangle red in next line?
\documentclass[11pt,a4paper,twocolumn]{article} ... \begin{equation*} \left| \dot{r} \right| = \sqrt{{- \, {e}^{-t} \left( \cos t + \sin t \right)}^{2} \, + \, {{e}^{-t} \left( \cos t + \sin t \right)}^{2} \, + \, {(- \, {e}^{-t})}^{2}} \end{equation*}
Best Answer
I suggest using the
multlined
environment frommathtools
to break the radicand . You also can choose not to break it, but to type in medsize (~80 % of \displaystyle) with the\mediummath
command fromnccmath
. I took the opportunity to clean your code: