plot3d 1/(x^2+ xy+ y^2) from x = -1/pi to 1/pi, y = -1/pi to 1/pi plot3d 1/(x^2+ xy+ y^2) from x = -1/pi to 1/pi, y = -1/pi to 1/pi
plot3d Re[tan(1/(x+i y))] from x = -1/pi to 1/pi, y = -1/pi to 1/pi plot3d Re[tan(1/(x+i y))] from x = -1/pi to 1/pi, y = -1/pi to 1/pi
plot3d Re[sin(1/(x+i y))] from x = -1/pi to 1/pi, y = -1/pi to 1/pi plot3d Re[sin(1/(x+i y))] from x = -1/pi to 1/pi, y = -1/pi to 1/pi