surface=parametric_plot3d((r*cos(t),r*sin(t),1-2*r^2*sin(t)^2),(t,0,2*pi),(r,0,1),color="gray",opacity=.75)

    
    
    Evaluate
    

        

            
                Language:
                
                    Sage
                    Gap
                    GP
                    HTML
                    Macaulay2
                    Maxima
                    Octave
                    Python
                    R
                    Singular
                
            
        
    
    




    

    

        

        Messages