3
----------
/ 2\
| x |
2*|1 + --|
\ 4 /
$$\frac{3}{\frac{x^{2}}{2} + 2}$$
-3*x
-----------
2
/ 2\
| x |
4*|1 + --|
\ 4 /
$$- \frac{3 x}{4 \left(\frac{x^{2}}{4} + 1\right)^{2}}$$
/ 2 \
| 4*x |
12*|-1 + ------|
| 2|
\ 4 + x /
----------------
2
/ 2\
\4 + x /
$$\frac{\frac{48 x^{2}}{x^{2} + 4} - 12}{\left(x^{2} + 4\right)^{2}}$$