Example: f (x,y)= 5-x2-y2
Click the "Graph" button (this button also refreshes the graph).
Rotate the graph by clicking and dragging the mouse on the graph.
To erase the graph and all input fields, click the "Clear" button.
Hemisphere: f (x,y)=(25-x2-y2)
Paraboloid: f (x,y)=x2+y2-8
Saddle: f (x,y)=(x2-y2)/10
Waves: f (x,y)=cos(x-y)
Ripples: f (x,y)=cos(2(x2+y2))