2
1 2*x 21 9*x
- - + ------ + -------------------- + ------------------
2 2 / 2\ 2 / 2\
1 + x 64*\1 + x /*atan (x) 8*\1 + x /*atan(x)
--------------------------------------------------------
2
/ 2\ 3/4
\1 + x / *atan (x)
$$\frac{1}{\left(x^{2} + 1\right)^{2} \operatorname{atan}^{\frac{3}{4}}{\left (x \right )}} \left(\frac{2 x^{2}}{x^{2} + 1} + \frac{9 x}{8 \left(x^{2} + 1\right) \operatorname{atan}{\left (x \right )}} - \frac{1}{2} + \frac{21}{64 \left(x^{2} + 1\right) \operatorname{atan}^{2}{\left (x \right )}}\right)$$