\documentclass[a4paper]{article} \usepackage{lmodern} \usepackage{amssymb,amsmath} \usepackage[T1]{fontenc} \usepackage[utf8]{inputenc} \begin{document} \thispagestyle{empty} $$\sum \limits_{i=1}^{n^2}(x+2)$$ $$\prod \limits_{j=1}^{100}(3 \cdot x)$$ $$\lim_{x \rightarrow \infty}(14x^3 - 12)$$ $$\int \limits_{-12}^{4}(14x^3 - 12)$$ \end{document}