set terminal svg enhanced font "Arial,10" size 658,620
set output 'c:\temp\tan.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 -1.5*pi,-6 to -1.5*pi,6
set arrow arrowstyle 4 linestyle 0 from -0.5*pi,-6 to -0.5*pi,6
set arrow arrowstyle 4 linestyle 0 from 0.5*pi,-6 to 0.5*pi,6
set arrow arrowstyle 4 linestyle 0 from 1.5*pi,-6 to 1.5*pi,6
plot [-2*pi-0.3:2*pi+0.3] [-6:6] tan(x) linestyle 1
set output
unset arrow
unset label

I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.