Problème d'espacement interligne

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%codes utiles
% \begin{flalign*}
%             & (f_k)_j=e^{2\pi i \frac{(k-1)(j-1)}{N}} \\
% \end{flalign*}
% \begin{tit}
% TP 1 : Méthode de Newton
% \end{tit}
% \addcontentsline{toc}{part}{TP 1 : Méthode de Newton}
% \section*{Méthode de Newton pour la minimisation (Exercice 2)}
% \addcontentsline{toc}{chapter}{Méthode de Newton pour la minimisation (Exercice 2)}
% \begin{enumerate}
%     \item Etude analytique de $g$ 
%     \addcontentsline{toc}{section}{Etude analytique d'un polynôme de degré 4 (points critiques, minimum global).}
%
        % \begin{lstlisting}
        % labla
        % \end{lstlisting}
\documentclass{report}
\usepackage{amsmath, amsthm, amssymb}
\usepackage[utf8]{inputenc}
\usepackage[francais]{babel}
\usepackage{geometry}
\usepackage[dvipsnames]{xcolor}
\usepackage{setspace}
\usepackage{amsthm}
\usepackage{xcolor}
\usepackage{ntheorem}
\usepackage{lipsum}
\usepackage{graphicx}
\usepackage{listings}
\usepackage{enumitem}
\usepackage{listingsutf8}
\usepackage{variations}
\usepackage{placeins}
\usepackage{cite}
\usepackage[T1]{fontenc}
\addto\captionsfrench{\renewcommand*\contentsname{\center{Sommaire}}}
%\lstdefinestyle{base}{
 
 
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