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Triangle
on 21 Oct 2021
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[x,y]=meshgrid(-10:.02:10);
s=@(p,q)sin(((x-p).^2+(y-q).^2).^0.5);
mesh(x,y,s(2,0)+s(-1,1.732)+s(-1,-1.732))
colormap(gca,'cool')
view(0,90)
axis equal off