> plot3d([x*cos(y), x*sin(y), cosh(x)], x = -5 .. 5, y = 0 .. 2*Pi); 1
 

Plot 

> plot3d([x*cos(t), x*sin(t), 1-(x-1)^3], t = 0 .. 2*Pi, x = .7 .. 1.3); 1
 

Plot 

> plot3d([(2+cos(x))*cos(t), (2+cos(x))*sin(t), sin(x)], t = 0 .. 2*Pi, x = 0 .. 2*Pi); 1
 

Plot 

> plot3d([x, y, x^2+y^2], x = -2 .. 2, y = -2 .. 2); 1
 

Plot 

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