atan(x) 2 *(-2*x + log(2))*log(2) ------------------------------- 2 / 2\ \1 + x /
/ 2 2 \ atan(x) | log (2) 8*x 6*x*log(2)| 2 *|-2 + ------- + ------ - ----------|*log(2) | 2 2 2 | \ 1 + x 1 + x 1 + x / ---------------------------------------------------- 2 / 2\ \1 + x /