-1 + x -1 + x -1 + x
2 -1 + ------ -1 + ------ -1 + ------
1 4*x 1 + x 1 + x 1 + x
--------- - --------- - ----------- - ------------------- - -------------------
2 3 3 2 2
/ 2\ / 2\ 2*(-1 + x) 2*(1 + x)*(-1 + x) 2*(1 + x) *(-1 + x)
\1 + x / \1 + x /
$$- \frac{4 x^{2}}{\left(x^{2} + 1\right)^{3}} + \frac{1}{\left(x^{2} + 1\right)^{2}} - \frac{\frac{x - 1}{x + 1} - 1}{2 \left(x - 1\right) \left(x + 1\right)^{2}} - \frac{\frac{x - 1}{x + 1} - 1}{2 \left(x - 1\right)^{2} \left(x + 1\right)} - \frac{\frac{x - 1}{x + 1} - 1}{2 \left(x - 1\right)^{3}}$$