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plot3d( f(x,y), x=0..2*Pi, y=0..2*Pi );4.2 Graphing in Three Dimensions • 113By default, Maple displays the graph as a shaded surface, but you canchange this by using either the menus or the style option. For example,style=hidden draws the graph as a hidden wireframe structure.> plot3d( f(x,y), x=0..2*Pi, y=0..2*Pi, style=hidden );For a list of style options, refer to ?plot3d,options.The range of the second parameter can depend on the first parameter.> plot3d( sqrt(x-y), x=0..9, y=-x..x );