\documentclass[11pt,a4paper]{article} \usepackage[polish]{babel} \usepackage[T1,nomathsymbols]{polski} \usepackage{polski} \usepackage[latin2]{inputenc} \selectlanguage{polish} \usepackage{dsfont} \parindent0em \usepackage{graphicx} \title{LateX} \author{Remigiusz Durka} \begin{document} \maketitle \section{Rzdział 1} Check this identity: $$(x + 1)^2 = x^2 + 2x + 1$$ If you want have numerated equation please use something like this: \begin{equation} x+y=z \end{equation} $$sin (\alpha\pi)=\beta$$ \section{Rzdział 2} Polskie litery: Zażółć gęślą jaźń \end{document}