$$\frac{6 x^{2}}{4 x^{6} + 1}$$
/ 6 \
| 12*x |
12*x*|1 - --------|
| 6|
\ 1 + 4*x /
-------------------
6
1 + 4*x $$\frac{12 x}{4 x^{6} + 1} \left(- \frac{12 x^{6}}{4 x^{6} + 1} + 1\right)$$
/ 6 12 \
| 108*x 576*x |
12*|1 - -------- + -----------|
| 6 2|
| 1 + 4*x / 6\ |
\ \1 + 4*x / /
-------------------------------
6
1 + 4*x $$\frac{1}{4 x^{6} + 1} \left(\frac{6912 x^{12}}{\left(4 x^{6} + 1\right)^{2}} - \frac{1296 x^{6}}{4 x^{6} + 1} + 12\right)$$