-2 2.1 setxrange -1.3 1.8 setyrange 60 setxunit 90 setangle_repere traceaxes axesarrow /O{0 0} def /cerc{O 1} def cerc cercle /X {38.17 cerc cpoint} def /Y {141.93 cerc cpoint} def gsave pointilles [-1.8 0.618 1.2 0.618] ligne [-1.8 1 1.2 1] ligne grestore $1$ 0 1 [1.4 dup] urtexlabel $u$ 2.05 0 [1.4 dup] dltexlabel $v$ 0 1.7 [1.4 dup] crtexlabel $\arcsin\left({\frac{-1+\sqrt{5}}{2}}\right)$ 0.7 0.618 [1.1 dup] urtexlabel $\pi-\arcsin\left({\frac{-1+\sqrt{5}}{2}}\right)$ -0.3 0.618 [1.1 dup] dltexlabel [0 0.618] points ${\frac{-1+\sqrt{5}}{2}}$ 0 0.618 [1.1 dup] drtexlabel gsave 4.2 setlinewidth 38.17 141.93 cerc Cercle grestore /dotscale {2.0 dup} def gsave [X Y 0 1] {point} plot grestore