x
------ + atan(x)
2
1 + x
$$\frac{x}{x^{2} + 1} + \operatorname{atan}{\left (x \right )}$$
/ 2 \
| x |
2*|1 - ------|
| 2|
\ 1 + x /
--------------
2
1 + x
$$\frac{1}{x^{2} + 1} \left(- \frac{2 x^{2}}{x^{2} + 1} + 2\right)$$
/ 2 \
| x |
8*x*|-1 + ------|
| 2|
\ 1 + x /
-----------------
2
/ 2\
\1 + x /
$$\frac{8 x}{\left(x^{2} + 1\right)^{2}} \left(\frac{x^{2}}{x^{2} + 1} - 1\right)$$