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on 4 Oct 2022
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x=120:0.1:180;
y=x;
[x, y]=meshgrid(x,y);
func=-(y+20).*sin(sqrt(abs(x./2+y+40)))-x.*sin(sqrt(abs(x-y-40)));
fun=(y+20).*sin(sqrt(abs(x./2+y+40)))-x.*sin(sqrt(abs(x-y-40)));
surf(func,x,y)
hold on
surf(-func,x,y)
surf(fun,x,y)
surf(-fun,x,y)
view(179,60)
colormap gray(10)
shading interp
axis off

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