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\setlength{\topmargin}{-36mm}
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\pagestyle{empty}

\begin{document}
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% bounding box
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% y axis marks
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\textcolor{cAxe}{\put(9,5){\makebox(0,0)[r]{$-\frac{\pi}{2}$}}}%
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% x axis marks
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% axes
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% function graph
\thicklines
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