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CODE:
function s=Ct(v)
if v<11.4
    error
    return
end
eq1='2*1.29*pi*63^2*v^3*x*(1-x)^2-5e6';
x=solve(eq1);
x=eval(x);
x=real(x);
a=x(x>0&x<0.5);
s=4*a*(1-a);
return

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