set yrange=[-5:5]
plot x=2*cos(t)/cos(t-floor((t+PI/5)/(2*PI/5))*2*PI/5),y=2*sin(t)/cos(t-floor((t+PI/5)/(2*PI/5))*2*PI/5)
plot y=2/cos(x/2-floor((x/2+PI/5)/(2*PI/5))*2*PI/5)
plot x=cos(t)/cos(t-2*floor((t/2+PI/5)/(2*PI/5))*2*PI/5),y=sin(t)/cos(t-2*floor((t/2+PI/5)/(2*PI/5))*2*PI/5)
plot y=1/cos(x/2-2*floor((x/4+PI/5)/(2*PI/5))*2*PI/5)