atan(3*x)
3*2 *log(2)
-------------------
2
1 + 9*x atan(3*x)
9*2 *(-6*x + log(2))*log(2)
-----------------------------------
2
/ 2\
\1 + 9*x / / 2 2 \
atan(3*x) | log (2) 72*x 18*x*log(2)|
27*2 *|-2 + -------- + -------- - -----------|*log(2)
| 2 2 2 |
\ 1 + 9*x 1 + 9*x 1 + 9*x /
-------------------------------------------------------------
2
/ 2\
\1 + 9*x /