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answered 2014-12-04 18:12:06 +0200
One way is like that:
sage: var('x,y') (x, y) sage: f=x**2+y**2 sage: contour_plot(f,(x,-2,2),(y,-2,2))
You can also use plot3d to see the function as a surface in space:
sage: plot3d(f,(x,-2,2),(y,-2,2))