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All published worksheets from http://sagenb.org

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var ('x y z') xmin=-.1;xmax=1;ymin=-.1;ymax=1;zmin=-.1;zmax=1; P=plot3d(1-x-y,(x,xmin,xmax),(y,ymin,ymax),color='purple', opacity=.6) P1=implicit_plot3d(x==0,(x,xmin,xmax),(y,ymin,ymax),(z,zmin,zmax), color='red', opacity=.2) P2=implicit_plot3d(y==0,(x,xmin,xmax),(y,ymin,ymax),(z,zmin,zmax), color='green', opacity=.2) P3=implicit_plot3d(z==0,(x,xmin,xmax),(y,ymin,ymax),(z,zmin,zmax), color='blue', opacity=.2) show(P+P1+P2+P3)
integral(integral(1-x-y,y,0,1-x),x,0,1)
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