2 x ----------------------- / 2 \ x \x + 7*x*y/*---------- 2 2 x - 49*y
x^2/((x^2 + 7*x*y)*((x/(x^2 - 49*y^2))))
/ 2 2\ x*\x - 49*y / -------------- 2 x + 7*x*y
3 2 x 49*x*y ---------- - ---------- 2 2 x + 7*x*y x + 7*x*y
x^3/(x^2 + 7*x*y) - 49*x*y^2/(x^2 + 7*x*y)
/ 2 2\ x*\x - 49*y / -------------- 2 x + 7*x*y
x*(x^2 - 49*y^2)/(x^2 + 7*x*y)
/ 2 2\ x*\x - 49*y / -------------- 2 x + 7*x*y
x*(x^2 - 49*y^2)/(x^2 + 7*x*y)
2 2 x - 49*y ---------- x + 7*y
(x^2 - 49*y^2)/(x + 7*y)