> #sfb sep 01, 2004
> plot3d(x^2+y^2,x=-3..3,y=-3..3);
> plot3d(x^2-y^2,x=-3..3,y=-3..3);
> with(plots);
Warning, the name changecoords has been redefined


  [animate, animate3d, animatecurve, arrow, changecoords, complexplot,

        complexplot3d, conformal, conformal3d, contourplot,

        contourplot3d, coordplot, coordplot3d, cylinderplot,

        densityplot, display, display3d, fieldplot, fieldplot3d,

        gradplot, gradplot3d, graphplot3d, implicitplot,

        implicitplot3d, inequal, interactive, listcontplot,

        listcontplot3d, listdensityplot, listplot, listplot3d,

        loglogplot, logplot, matrixplot, odeplot, pareto, plotcompare,

        pointplot, pointplot3d, polarplot, polygonplot, polygonplot3d,

        polyhedra_supported, polyhedraplot, replot, rootlocus,

        semilogplot, setoptions, setoptions3d, spacecurve,

        sparsematrixplot, sphereplot, surfdata, textplot, textplot3d,

        tubeplot]

> implicitplot3d(x^2+y^2-z^2=1,x=-3..3,y=-3..3,z=-3..3);
> implicitplot3d(x^2+y^2-z^2=1,x=-3..3,y=-3..3,z=-3..3,numpoints=4000);