2
1 1 2*x
- ------ - ------ + ---------
2 2 2
1 + x x + 1 / 2 \
\x + 1/
$$\frac{2 x^{2}}{\left(x^{2} + 1\right)^{2}} - \frac{1}{x^{2} + 1} - \frac{1}{x^{2} + 1}$$
/ 2 \
| x |
8*x*|1 - ------|
| 2|
\ 1 + x /
----------------
2
/ 2\
\1 + x /
$$\frac{8 x \left(- \frac{x^{2}}{x^{2} + 1} + 1\right)}{\left(x^{2} + 1\right)^{2}}$$
/ 2 4 \
| 7*x 6*x |
8*|1 - ------ + ---------|
| 2 2|
| 1 + x / 2\ |
\ \1 + x / /
--------------------------
2
/ 2\
\1 + x /
$$\frac{8 \left(\frac{6 x^{4}}{\left(x^{2} + 1\right)^{2}} - \frac{7 x^{2}}{x^{2} + 1} + 1\right)}{\left(x^{2} + 1\right)^{2}}$$