2 2 a + b + 4*a*b --------------- 2 (a + b)
(a^2 + b^2 + 4*a*b)/(a + b)^2
2 2 a + b + 4*a*b --------------- 2 (a + b)
(a^2 + b^2 + 4*a*b)/(a + b)^2
2 2 a + b + 4*a*b --------------- 2 (a + b)
(a^2 + b^2 + 4*a*b)/(a + b)^2
2 b + a*(a + 4*b) ---------------- 2 (a + b)
(b^2 + a*(a + 4*b))/(a + b)^2
2 2 a + b + 4*a*b --------------- 2 (a + b)
(a^2 + b^2 + 4*a*b)/(a + b)^2