\documentclass{article}

\usepackage{pst-plot}%
\parindent=0pt
\begin{document}
\thispagestyle{empty}
\psset{xunit=2,yunit=2}
\begin{pspicture}(-2,2)(0,1)
   \psaxes[labels=none, ticks=none]{->}(0,0)(-2,0)(2,2)
   \psplot[linewidth=1pt,linecolor=red,algebraic=true]{-2}{2}{1-0.3/(1+1.5*x^2)}
    \uput[-90](1,0.5){$R(\theta,\delta_2)$}
    
   \psplot[linewidth=1pt,linecolor=blue,linestyle=dashed,algebraic=true]{-2}{2}{0.1+1/(2+cos(3.14*x/2))}
    \uput[-90](1,1.3){$R(\theta,\delta_1)$}

   \uput[-90](2.1,0.1){$\theta$}
  \uput[-90](0.1,2.1){$R$}
\end{pspicture}

\end{document}