Return in a knitr title

Just add \\ at the position of return

\documentclass[a4paper]{article}
\usepackage[utf8]{inputenc}
\begin{document}
\tableofcontents
\section{Essai\\Pour un titre}
<<>>=
degree <- "o"
print(degree)
@
\end{document}

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Standard error from Hessian Matrix... what can be done when problem occurs

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