# How to get a bracket that looks like this?

I'm trying to get a bracket that looks like this :

I tried

$4\tan^2\left(\dfrac{x}{3}\right)$


• Use a font with narrow brackets. – Henri Menke Aug 3 '18 at 2:13
• that kind of parentheses do not look nice, they are too big ... – user2478 Aug 3 '18 at 5:37

Remaining within Computer Modern fonts, the characters called, respectively, \lgroup and \rgroup get pretty close to what you ask, although they don’t look quite the same. The mleftright package fixes the space around \left and \right delimiters.

% 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}


This is the output:

I wouldn't use this kind of braces ... However, use \lgroup and \rgroup

\documentclass[12pt]{article}
\usepackage{amsmath}

\delimitershortfall=-1pt % make it larger
\begin{document}

$4\tan^{2} \left\lgroup\dfrac{x}{3}\right\rgroup$

\end{document}