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 /