atan(3*x)
3*5 *log(5)
-------------------
2
1 + 9*x atan(3*x)
9*5 *(-6*x + log(5))*log(5)
-----------------------------------
2
/ 2\
\1 + 9*x / / 2 2 \
atan(3*x) | log (5) 72*x 18*x*log(5)|
27*5 *|-2 + -------- + -------- - -----------|*log(5)
| 2 2 2 |
\ 1 + 9*x 1 + 9*x 1 + 9*x /
-------------------------------------------------------------
2
/ 2\
\1 + 9*x /