> plot3d(2*sin(y),x=-2*Pi..2*Pi,y=-2*Pi..2*Pi,scaling=constrained,shading=z,title="f(x,y) = sin(y)",titlefont=[HELVETICA,24]);

[Plot]

> plot3d([r*cos(theta),r*sin(theta),sin(2*theta)/2],r=1..3,theta=0..2*Pi,scaling=constrained,shading=z,title="f(r, theta) = sin(2*theta)",titlefont=[HELVETICA,24]);

[Plot]

> plot3d([r*cos(theta),r*sin(theta),2*cos(r)],r=0..9,theta=0..2*Pi,scaling=constrained,shading=z,title="f(r, theta) = cos(r)",titlefont=[HELVETICA,24]);

[Plot]

> plot3d(3*sin(x)*sin(y),x=-2*Pi..2*Pi,y=-2*Pi..2*Pi,scaling=constrained,shading=z,title="f(x,y) = sin(x)*sin(y)",titlefont=[HELVETICA,24]);

[Plot]

> plot3d([r*cos(theta),r*sin(theta),cos(3*r)*sin(2*theta)/2],r=1..3,theta=0..2*Pi,scaling=constrained,shading=z,title="f(r, theta) = cos(3*r)*sin(2*theta)",titlefont=[HELVETICA,24]);

[Plot]

>