# Why the * in \newcommand*? [duplicate]


Here's a simple MWE to play with, in case it is usefeull here:

\documentclass[11pt,letterpaper,twoside]{book}
\usepackage{lmodern}
\usepackage{amsmath}
\usepackage{mathtools}

\newcommand*{\bigs}[1]{\vcenter{\hbox{\scalebox{1.25}{#1}}}} % Why the *?

\begin{document}

Blabla bla bla blabla :
$$c \, \bigs( 1 + (x - y^2)(a + b) \bigs) = \tfrac{3}{4}.$$

\end{document}

• Thanks. So my question is a duplicate. – Cham Dec 9 '19 at 0:06
• From cat to cat: yes. ;-) – user194703 Dec 9 '19 at 0:35