\begin{cminipage}[fond3] \begin{center}$ \frac1{\cos x} = {1 + {{1}\over{2}}x^{2} + {{5}\over{24}}x^{4} + {{61}\over{720}}x^{6} + {{277}\over{8064}}x^{8} + {{50521}\over{3628800}}x^{10} + {{540553}\over{95800320}}x^{12}+ O(x^{13})} $\end{center} \end{cminipage} \begin{center}\includegraphics[scale=0.50]{dl04.ps}\end{center}