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