\input{preamble-standalone.ltx}
\begin{document}

% Ex. No. 52 (Section  7.0.9 : Use of \tkzname{pi} with \tkzcname{tkzGrid})

\begin{tikzpicture}[scale=.75]
   \tkzInit[xmax=6.5,ymax=6.5]
   \tkzGrid[xstep=pi,ystep=pi/2,sub,
            subxstep=pi/4,subystep=pi/4]
   \tkzLabelX[label=$t$,orig=false,trig=4,
            below=6pt,font=\scriptsize]
   \tkzLabelY[trig=2,font=\scriptsize]
   \tkzDrawXY
\end{tikzpicture}

\end{document}