> t3:= x -> tan(x);

> it3:= x -> arctan(x);

> w1:= plot(t3(x), x = -Pi/2 + 0.1.. Pi/2 - 0.1, thickness=2, color = black):

> w2:= plot(it3(x), x = -10..10, thickness=2, color = red):

> w3:= plot(x, x = -10..10, thickness=2, color = blue):

> w4:= textplot([5.5,2.5,`arctan(x)`], thickness=2, color = magenta):

> w5:= textplot([8.5,7,`y=x`], thickness=2, color = magenta):

> w6:= textplot([3,8,`tan(x)`], thickness=2, color = magenta):

> display({w1,w2,w3,w4,w5,w6});