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\title{\bf Feuille de Travaux Dirig\'es 2}

\begin{document}

{Licence de Sciences \'Economiques} \hfill {Ann\'ee 2004-2005}

{Universit\'e de Nice Sophia-Antipolis} \hfill {Math\'ematiques L1}\\

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\maketitle 

\begin{ex} $\ $ 

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\begin{ex} 
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