File: plotting20.mac

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plot3d ([[-3*x-y, [x,-2,2], [y,-2,2]], 4*sin(3*(x^2+y^2))/(x^2+y^2), [x,-3,3],
  [y,-3,3]], [x,-4,4], [y,-4,4], [pdf_file,"./plotting20.pdf"]);
plot3d ([[-3*x-y, [x,-2,2], [y,-2,2]], 4*sin(3*(x^2+y^2))/(x^2+y^2), [x,-3,3],
  [y,-3,3]], [x,-4,4], [y,-4,4], [png_file,"./plotting20.png"]);