\begin{pspicture*}[showgrid=bottom](-3,-3)(3,3)
    %\psset{xunit=1 cm, algebraic=true}
    %\psgrid[xunit=0.5, yunit=0.5, subgriddiv=0, gridcolor=lightgray]
    \psaxes[ticks=none,labels=none]{->}(0,0)(-3,-3)(3,3)

    \pscircle(0,0){2}
    \SpecialCoor
    \psdots(2;-60)(2;-120)(2;-150)(2;0)

    \uput[ur](2;0){$A$}


    \uput[r](2;-60){$P \; \frac{-\pi}{3}$}
    \psline(0;0)(2;-60)
    \psarc{<-}(0,0){0.8}{-60}{0}

    \uput[l](2;-120){$Q \; \frac{-2\pi}{3}$}
    \psline(0;0)(2;-120)
    \psarc{<-}(0,0){0.6}{-120}{0}

    \psline(0;0)(2;-150)
    \uput[l](2;-150){$R \; \frac{-5\pi}{6}$}
    \psarc{<-}(0,0){1}{-150}{-60}


\end{pspicture*}
