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\psset{trigLabels=true,labelFontSize=\scriptstyle,xunit=\pstRadUnit}
\begin{pspicture}(-\psPiTwo,-4)(10,4)
\psaxes[trigLabelBase=2]{<->}(0,0)(-\psPiTwo,-5)(\psPiTwo,5)
\psplot[xunit=1cm,linecolor=red,linewidth=1.5pt]{-\psPiTwo}{\psPiTwo}{x 2 mul 3.14159265 add RadtoDeg cos 2 mul 2 sub}
Nick