6
--------------
2
1 + (6*x - 1) $$\frac{6}{\left(6 x - 1\right)^{2} + 1}$$
-72*(-1 + 6*x)
------------------
2
/ 2\
\1 + (-1 + 6*x) / $$- \frac{432 x - 72}{\left(\left(6 x - 1\right)^{2} + 1\right)^{2}}$$
/ 2 \
| 4*(-1 + 6*x) |
432*|-1 + ---------------|
| 2|
\ 1 + (-1 + 6*x) /
--------------------------
2
/ 2\
\1 + (-1 + 6*x) / $$\frac{\frac{1728 \left(6 x - 1\right)^{2}}{\left(6 x - 1\right)^{2} + 1} - 432}{\left(\left(6 x - 1\right)^{2} + 1\right)^{2}}$$