x,y=var('x,y')
plot(x^2-2*x+3,color="green",axes=False)
plot(cos(2*x),(x,-3,6),frame=False)
plot(sin(1/x),thickness=10,linestyle='-.',gridlines=True)
plot3d(x^2+y^2,(x,-2,2),(y,-2,2))
plot3d(x^2-y^2+2*x*y^2+1,(x,-2,2),(y,-2,2))