答案1
保留在 Computer Modern 字体中,分别调用的字符\lgroup
和\rgroup
非常接近您要求的字符,尽管它们看起来不太一样。该mleftright
包修复了周围的空格\left
和\right
分隔符。
% My standard header for TeX.SX answers:
\documentclass[a4paper]{article} % To avoid confusion, let us explicitly
% declare the paper format.
\usepackage[T1]{fontenc} % Not always necessary, but recommended.
% End of standard header. What follows pertains to the problem at hand.
\usepackage{mleftright}
\begin{document}
See \textsl{The \TeX book}, p.~150:
\[ 4\tan^{2} \mleft\lgroup \frac{x}{3} \mright\rgroup \]
\end{document}
这是输出: