Hi I am using the class report ( my University wants me to use it ) , but I cannot label any equation . An except of my code :
\documentclass[12pt,a4paper]{report}
\usepackage{graphicx}
\graphicspath{ {Home/} }
\usepackage{newlfont}
\usepackage{color}
\usepackage{mathtools}
\usepackage{amsmath}
\usepackage{cool}
\usepackage{esdiff}
\begin{document}
\begin{document}
\begin{equation} \label{eq:1}
x(t+\Delta) = x(to) + \int_{to}^{to+\Delta} f(x,t) dt
\end{equation}
\end{document}