\documentclass[12pt]{article}
\usepackage[margin=1in]{geometry}
\usepackage{multicol}
% \usepackage[spanish]{babel}
% \AtBeginDocument{\selectlanguage{spanish}}
\usepackage{xcolor}
\usepackage{amsmath}
\usepackage{gensymb}
\usepackage{cancel}
\usepackage{tikz}
\usetikzlibrary{calc}

\begin{document}
$body$
\end{document}