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