2812.sagews

x,y = var('x y')
k = 3
plot3d(abs(sec(pi/x)) * tan(y*pi)^2,(x,-k,k),(y,-k,k))

x,y = var('x y')
k = 3
plot3d(abs(sec(pi/x)) * tan(y*pi)^2,(x,-k,k),(y,-k,k),plot_points=100)