var('x','y')
plot(x^2-2*x+3,-5,5)
plot(cos(2*x),-5,5)
plot(sin(1/x),-5,5)
plot3d(x^2+y^2,(x,-1,1),(y,-1,1))
plot3d(x^2-y^2+2*x*y^2+1,(x,-1,1),(y,-1,1))