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