\documentclass[12pt,a4paper]{article}
\usepackage{amsthm,amssymb,amsmath}
\usepackage[pagebackref=true,colorlinks,linkcolor=blue,citecolor=magenta]{hyperref}
%\usepackage[pagebackref=false]{hyperref}
%\usepackage{makeidx}
%\makeindex
\usepackage{multicol}
\usepackage{xepersian}

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\begin{document}
\begin{multicols}{2}
\begin{enumerate}
\item
$\int xe^xdx$
\item
$\int x\cos xdx$
\item
$\int x^2e^xdx$
\item
$\int e^x\sin xdx$
\item
$\int\ln xdx$
\item
$\int x\tan^{-1}xdx$
\end{enumerate}
\end{multicols}
\end{document}