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 /