atan(x) 4 *(-2*x + log(4))*log(4) ------------------------------- 2 / 2\ \1 + x /
/ 2 2 \ atan(x) | log (4) 8*x 6*x*log(4)| 4 *|-2 + ------- + ------ - ----------|*log(4) | 2 2 2 | \ 1 + x 1 + x 1 + x / ---------------------------------------------------- 2 / 2\ \1 + x /