/ 2 \ / 2 \ \x + b/*\x + 2*b/
(x^2 + b)*(x^2 + 2*b)
/ 2\ / 2\ | x | 1*\b + x /*|b + --| \ 2 /
(1*(b + x^2))*(b + x^2/2)
(b + x^2)*(x^2 + 2.0*b)
4 2 2 x + 2*b + 3*b*x
x^4 + 2*b^2 + 3*b*x^2