\documentclass{article} \usepackage{amsmath} % pkg required by EasyLatex \usepackage{amsfonts} % pkg required by EasyLatex \usepackage{amssymb} % pkg required by EasyLatex \usepackage{psfrag} % pkg required by EasyLatex \usepackage[dvips]{graphicx} % pkg required by EasyLatex \begin{document} ($f \circ g)^{-1}$ \end{document}