log(x) 1 atan(x) ------ - - + 1 - ------- 4 x 2
log(x)/4 - 1/x + 1 - atan(x)/2
1 1 1 -- - ---------- + --- 2 / 2\ 4*x x 2*\1 + x /
2 1 x - -- - ---- + --------- 3 2 2 x 4*x / 2\ \1 + x /
2 1 1 6 4*x --------- + ---- + -- - --------- 2 3 4 3 / 2\ 2*x x / 2\ \1 + x / \1 + x /