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