atan(x) 5
atan(x) 5 *log(5) --------------- 2 1 + x
atan(x) 5 *(-2*x + log(5))*log(5) ------------------------------- 2 / 2\ \1 + x /
/ 2 2 \ atan(x) | log (5) 8*x 6*x*log(5)| 5 *|-2 + ------- + ------ - ----------|*log(5) | 2 2 2 | \ 1 + x 1 + x 1 + x / ---------------------------------------------------- 2 / 2\ \1 + x /