___
1 2*\/ 5
---------- - -------
/ 2\ 3
3*\1 + x / x
$$\frac{1}{3 \left(x^{2} + 1\right)} - \frac{2 \sqrt{5}}{x^{3}}$$
/ ___ \
|3*\/ 5 x |
2*|------- - -----------|
| 4 2|
| x / 2\ |
\ 3*\1 + x / /
$$2 \left(- \frac{x}{3 \left(x^{2} + 1\right)^{2}} + \frac{3 \sqrt{5}}{x^{4}}\right)$$
/ ___ 2 \
| 1 12*\/ 5 4*x |
2*|- ----------- - -------- + -----------|
| 2 5 3|
| / 2\ x / 2\ |
\ 3*\1 + x / 3*\1 + x / /
$$2 \left(\frac{4 x^{2}}{3 \left(x^{2} + 1\right)^{3}} - \frac{1}{3 \left(x^{2} + 1\right)^{2}} - \frac{12 \sqrt{5}}{x^{5}}\right)$$