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on 7 Oct 2021
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n = 99;
[u,v] = deal(linspace(0,pi,n));
u = repmat(u,n,1);
v = repmat(v',1,n);
x = cos(v).*sin(u);
y = sin(v).*sin(u);
z = cos(u);
a = x.^2;
b = y.^2;
c = z.^2;
i=b-a;
j=b-c;
k = x+y+z;
f = (9*a-b-c) + 9*y.*z.*j + x.*y.*i;
g = j + z.*x.*(c-a) + x.*y.*i;
surf(f,g,u,'LineStyle','none');
view(90,-90);
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