\MULTIPLY{3}{\numberQUARTERPI}{\numberTQPI}
\SIN{\numberTQPI}{\sinTQPI}

\begin{center}
\setlength{\unitlength}{2cm}
\begin{Picture}(-0.5,-1.5)(6.5,1.5)
{\referencesystem(0,0)(\numberHALFPI,0)(0,1)
\makenolabels
\renewcommand{\Pictlabelsep}{0.1}
\highestlabel{$-3\pi/2$}
\cartesianaxes(0,-1.5)(4.25,1.5)

\rPut{l}(0,-1){$-1$}                           % put the y-axis labels at left
\rPut{l}(0,0){$0$}
\rPut{l}(0,1){$1$}
\rPut*{bbl}(1,0){$\pi/2$}                      % put "\pi/2" at bbl
\rPut*{b}(2,0){$\pi$}                          % put "\pi" at bottom
\rPut*{bbr}(3,0){$3\pi/2$}                     % put "3\pi/2" at bbr
\rPut*{b}(4,0){$2\pi$}                         % put "2\pi" at bottom

\rPut*{b}(0,0){\pictcolor{gray}\xLINE(0.75,0)(4.25,0)}} % \baseline of x-labels

\PlotFunction[8]{\COSfunction}{0}{\numberTWOPI}
\PlotFunction[8]{\SINfunction}{0}{\numberTWOPI}

\Put[NE](\numberTQPI,\sinTQPI){$\sin x$}       % put "\sin x" at NorthEast
\Put[E](\numberTWOPI,1){$\cos x$}              % put "\cos x" at East
\end{Picture}
\end{center}
