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