set terminal svg enhanced font "Arial,10" size 658,620
set output 'c:\temp\cotan.svg'
set border 0
set style arrow 2 head filled lw 2 size 0.15,30
set style arrow 4 nohead 
set samples 1000
unset key
set xtics axis ("ÔÇô2¤Ç" -2*pi, "ÔÇô3/2 ¤Ç" -1.5*pi, "ÔÇô¤Ç" -pi, "ÔÇô1/2 ¤Ç" -pi/2, "1/2 ¤Ç" pi/2, "¤Ç" pi, "3/2 ¤Ç" 1.5*pi, "2¤Ç" 2*pi) scale 0.5
set x2tics axis ("ÔÇô360^o" -2*pi, "ÔÇô270^o" -1.5*pi, "ÔÇô180^o" -pi, "ÔÇô90^o" -pi/2, "90^o" pi/2, "180^o" pi, "270^o" 1.5*pi, "360^o" 2*pi) scale 0.5 offset 0,2.7
set style line 3 lw 1 lt 5 lc rgb "black"
set style line 1 lc rgb "blue" lw 2
set ytics axis (-6, -5, -4, -3, -2, -1, 1, 2, 3, 4, 5, 6) scale 0.5
set arrow arrowstyle 2 from -2*pi-0.3,0 to 2*pi+0.3,0
set arrow arrowstyle 2 from 0,-6.2 to 0,6.2
set arrow arrowstyle 4 linestyle 0 from -2*pi,-6 to -2*pi,6
set arrow arrowstyle 4 linestyle 0 from -pi,-6 to -pi,6
set arrow arrowstyle 4 linestyle 0 from pi,-6 to pi,6
set arrow arrowstyle 4 linestyle 0 from 2*pi,-6 to 2*pi,6
plot [-2*pi-0.3:2*pi+0.3] [-6:6] 1/tan(x) linestyle 1
set output
unset arrow
unset label

我，本作品著作权人，释出本作品至公有领域。这适用于全世界。 在一些国家这可能不合法；如果是这样的话，那么： 我无条件地授予任何人以任何目的使用本作品的权利，除非这些条件是法律规定所必需的。