File:00.png

Summary
\documentclass[12pt]{article} \usepackage{geometry} \paperwidth 135pt \paperheight 135pt \topmargin -100pt \oddsidemargin -70pt \pagestyle{empty} \begin{document} \Large \parindent 0pt $f(x)=\sqrt{\exp}(x)$ \vskip 9pt $f=\sqrt{\exp}$ \vskip 9pt $f^2=\exp$ \vskip 9pt $f(f(x))=\exp(x)$ \end{document}