\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
\ \frac{d\langle v_{dcL} \rangle _0}{dt}&=\frac{1}{C_{dcL}}\Big[2{\langle S_{D2} \rangle ^R_1\langle i_{tp} \rangle ^R_1+\langle S_{D2} \rangle ^I_1\langle i_{tp} \rangle ^I_1-\langle S_{i1} \rangle ^R_1\langle i_{fi1} \rangle ^R_1 -\langle S_{i1} \rangle ^I_1\langle i_{fi1} \rangle ^I_1}\Big] \\
\end{align}
\end{document}
答案1
手动操作,使用
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
\ \frac{d\langle v_{dcL} \rangle _0}{dt}&=\frac{1}{C_{dcL}}\Big[2
\langle S_{D2} \rangle ^R_1\langle i_{tp} \rangle ^R_1+\\
&\langle S_{D2} \rangle ^I_1\langle i_{tp} \rangle ^I_1-\langle
S_{i1} \rangle ^R_1\langle i_{fi1} \rangle ^R_1 -\langle S_{i1}
\rangle ^I_1\langle i_{fi1} \rangle ^I_1 \Big]
\end{align}
\end{document}
输出为: