/ 2 \ / 2\ \x + m/*\m - x /
(x^2 + m)*(m - x^2)
/ 2\ / 2\ 1*\m + x /*\m - x /
(1*(m + x^2))*(m - x^2)
2 4 m - x
m^2 - x^4
(m + x^2)*(m - x^2)
/ 2\ / 2 \ -\m + x /*\x - m/
-(m + x^2)*(x^2 - m)