2
2*x / 2\
------ + atan\x /
4
1 + x
$$\frac{2 x^{2}}{x^{4} + 1} + \operatorname{atan}{\left (x^{2} \right )}$$
/ 4 \
| 4*x |
2*x*|3 - ------|
| 4|
\ 1 + x /
----------------
4
1 + x
$$\frac{2 x}{x^{4} + 1} \left(- \frac{4 x^{4}}{x^{4} + 1} + 3\right)$$
/ 4 8 \
| 32*x 32*x |
2*|3 - ------ + ---------|
| 4 2|
| 1 + x / 4\ |
\ \1 + x / /
--------------------------
4
1 + x
$$\frac{1}{x^{4} + 1} \left(\frac{64 x^{8}}{\left(x^{4} + 1\right)^{2}} - \frac{64 x^{4}}{x^{4} + 1} + 6\right)$$