x = (2*(cos(u) + u*sin(u))*sin(v))/(1+ u^2*sin(v)^2)
y = (2*(sin(u) - u*cos(u))*sin(v))/(1+ u^2*sin(v)^2)
z = log(tan(1/2 *v)) + (2*cos(v))/(1+ u^2*sin(v)^2)
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