=(2n-1)*x^2*[(x^2) +b)^(n-0.5-1)]
=(2n-1)*[(x^2+b)-b]*[(x^2+b)^(n- 0,5-1)]
=(2n-1)*(x^2+b)^(n-0,5)-(2n-1)*b*[(x^2+b)^ (n-0.5-1)].
=(2n-1)*x^2*[(x^2) +b)^(n-0.5-1)]
=(2n-1)*[(x^2+b)-b]*[(x^2+b)^(n- 0,5-1)]
=(2n-1)*(x^2+b)^(n-0,5)-(2n-1)*b*[(x^2+b)^ (n-0.5-1)].