使用独立类时，如何删除 gather* 左侧的空白？

Question

\documentclass[preview,border=12pt,varwidth]{standalone}% change it back to your own document class
\usepackage{amsmath}

\begin{document}
\abovedisplayskip=0pt\relax% remove this line in  your production
\begin{gather*}
\int \sec^2(5 - 3x/4)\,\mathrm{d}x\\
\int \frac{1}{\cos^2 (5 - 3x/4)}\,\mathrm{d}x
\end{gather*}
\end{document}

gather*如何去除使用类时左边的空白standalone？

Answer 1

重新定义gather；它只是一行代码。你甚至不必设置\abovedisplayskip为零。

\documentclass[border=12pt]{standalone}
\usepackage{amsmath}

\newcommand{\diff}{\mathop{}\!d}
\renewenvironment{gather*}{$\gathered}{\endgathered$}

\begin{document}
\begin{gather*}
\int \sec^2(5 - 3x/4)\diff x\\
\int \frac{1}{\cos^2 (5 - \frac{3}{4}x)}\diff x
\end{gather*}
\end{document}