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function [x,i]=uu(x0,er)
s=1/2 - 5^(1/2)/2;
x(1)=x0;
i=1;
d=x(1)-s;
while(abs(d)>er)
x(i+1)=sqrt(1+x(i));
d=x(i+1)-s;
i=i+1;
end
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