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function g(a,b,c,d,e,f,x:real):real;
begin
         g:=(a*x*x+b*x+c)/(d*x*x+e*x+f);
    
end;

function g1(a,b,c,d,e,f,x:real):real;
begin
         g1:=(2*a*x+b)/(2*d*x+e);

end;					

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f'(x) = (a(f^2) + b·f - c·((d^2) + e))
        ------------------------------ 
            (x·((d^2) + e) + f)^2