\section{Fonctions cosinus et sinus}

\subsection{Définition et rappels}

\begin{minipage}{0.67\linewidth}
Soit $(O~;~I~,~J)$ un repère orthonormé direct. Le point $M$, image d'un réel $x$ sur le cercle trigonométrique de centre $O$,
a pour coordonnées $(\cos x~;~\sin x)$ où $\cos x$ est le cosinus de $x$ et $\sin x$ est le sinus de $x$.
\begin{center}
\begin{tabularx}{.8\linewidth}{|c|*{6}{>{\centering \arraybackslash}X|}}
\hline \rowcolor{FondTableaux} $x$ & 0 & $\pi/6$ & $\pi/4$ &$\pi/3$ & $\pi/2$ & $\pi$\\
\hline \cellcolor{FondTableaux} $\cos x$ & $1$ & $\sqrt{3}/2$ &  $\sqrt{2}/2$ &$1/2$ & $0$ & $-1$ \\
\hline \cellcolor{FondTableaux} $\sin x$ & $0$ & $1/2$ & $\sqrt{2}/2$ & $\sqrt{3}/2$ & $1$ & $0$ \\
\hline
\end{tabularx}
\end{center}
\end{minipage}
\begin{minipage}{0.25\linewidth}
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