放大、着色和加粗文本的正确方法是什么?以下方法均无效;
documentclass[a4paper,11pt,fleqn]{book}
% I just write the likely relevant packages.
\usepackage{physics}
\usepackage[hidelinks]{hyperref}
\usepackage{multirow}
\usepackage{color}
\usepackage{booktabs,colortbl}
\mdfdefinestyle{algos}{backgroundcolor=mygrey, linewidth = 1.95pt, frametitlerule=false, frametitlebackgroundcolor=myblue, %
hidealllines=true}
% All colors, perhaps is not the case to be written.
\definecolor{airforceblue}{rgb}{0.36, 0.54, 0.66}
\begin{document}
\large{\color{airforceblue} {\textbf{$N_L(k)$}}}
{\color{airforceblue} \textbf{\large $N_L(k)$}}
{\color{airforceblue} \large{\textbf{$N_L(k)$}}}
\end{document}