>	with(plots):

Warning, the name changecoords has been redefined

>	plot3d( x^2+y^2, x=-3..3, y=-3..3, axes=normal); plot3d( [ r*cos(t), r*sin(t), r^2], r=0..3, t=0..(2*Pi), axes=normal );

>	plot3d( cos(x)*sin(y), x=0..(2*Pi), y=0..(2*Pi), axes=normal);

>	plot3d( sin(x*y), x=(-2*Pi)..(2*Pi), y=(-2*Pi)..(2*Pi), axes=normal);

>	plot3d( exp(x*sin(y)), x=-3..3, y=-Pi..Pi, axes=normal);

>

>

>

>

>

>

>

>

>

>

>

>

>

>

>

>

>	implicitplot3d( z^2= x^2 + y^2, x=-3..3, y=-3..3, z=-3..3, axes=normal, numpoints=5000);

>	implicitplot3d( z = x^2 + y^2, x=-3..3, y=-3..3, z=-1..3, axes=normal, numpoints=5000);

>	implicitplot3d( z^2 = x^2 + y^2-1 , x=-3..3, y=-3..3, z=-3..3, axes=normal, numpoints=5000);

>	implicitplot3d( z^2 = x^2 + y^2+1 , x=-3..3, y=-3..3, z=-3..3, axes=normal, numpoints=5000);

>