\nbPointsRegular{8}Place on the unit circle the following angles and for each
one of them give the $\sin$ and the $\cos$:

\begin{multicols}{4}
\begin{enumerate}
	\item $\dfrac{5 \pi}{4}$
	\item $\dfrac{11 \pi}{6}$
	\item $\dfrac{\pi}{3}$
	\item $\pi$
\end{enumerate}
\end{multicols}

\begin{center}
\ifpdf
\includegraphics[width=10cm]{S5P4/2021_June/2021_06_S5P4_EEB4_EN_BTest_ExoA3_IMG1.jpg}
\else
\begin{center}
\def\unit{4.9}
\psset{unit=\unit cm}
\begin{pspicture}(-1.01,-1.05)(1,1.05)
\pnode(0,0){O}\uput[dl](O){O}
\pnode(1,0){I}\uput[r](I){I}
\pnode(0,1){J}\uput[u](J){J}
\psline[linewidth=1.5pt](-1,0)(I)
\psline[linewidth=1.5pt](0,-1)(J)
\psdots[dotstyle=+,dotangle=45,dotscale=1.5](I)(J)
\psarc(0,0){\unit cm}{-180}{180} %Cercle(centre O, rayon 1)
\multido{\n=0+15}{24}{
    \pgfmathparse{cos(\n)}\let\cosn=\pgfmathresult
    \pgfmathparse{sin(\n)}\let\sinn=\pgfmathresult
    \psline[linewidth=0.25pt,linestyle=dotted](O)(\cosn,\sinn)
}
\end{pspicture}
\end{center}
\fi
\end{center}
