-8*acot(4*x)
------------
2
1 + 16*x 32*(1 + 8*x*acot(4*x))
----------------------
2
/ 2\
\1 + 16*x / / 2 \
| 12*x 64*x *acot(4*x) |
256*|- --------- - --------------- + acot(4*x)|
| 2 2 |
\ 1 + 16*x 1 + 16*x /
-----------------------------------------------
2
/ 2\
\1 + 16*x /