2*x
--------------------
________________
/ 2
/ / 2\
\/ -1 + \1 + x /
$$\frac{2 x}{\sqrt{\left(x^{2} + 1\right)^{2} - 1}}$$
/ 2 / 2\ \
| 2*x *\1 + x / |
2*|1 - --------------|
| 2|
| / 2\ |
\ -1 + \1 + x / /
----------------------
________________
/ 2
/ / 2\
\/ -1 + \1 + x /
$$\frac{1}{\sqrt{\left(x^{2} + 1\right)^{2} - 1}} \left(- \frac{4 x^{2} \left(x^{2} + 1\right)}{\left(x^{2} + 1\right)^{2} - 1} + 2\right)$$
/ 2\
| 2 / 2\ |
| 2 6*x *\1 + x / |
4*x*|-3 - 5*x + --------------|
| 2|
| / 2\ |
\ -1 + \1 + x / /
--------------------------------
3/2
/ 2\
| / 2\ |
\-1 + \1 + x / /
$$\frac{4 x}{\left(\left(x^{2} + 1\right)^{2} - 1\right)^{\frac{3}{2}}} \left(\frac{6 x^{2} \left(x^{2} + 1\right)^{2}}{\left(x^{2} + 1\right)^{2} - 1} - 5 x^{2} - 3\right)$$