Here's a compilable example of a fraction with an integral on both parts :
Code: Select all
\documentclass[12pt,letterpaper]{article}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\begin{document}
\begin{equation}
A = \frac{\int_0^T \vec{v} \, \gamma \, d\tau}{\int_0^T \gamma \, d\tau}.
\end{equation}
\end{document}