2 6*atan (2*x) ------------ 2 1 + 4*x
24*(1 - 2*x*atan(2*x))*atan(2*x) -------------------------------- 2 / 2\ \1 + 4*x /
/ 2 2 \ | 1 2 12*x*atan(2*x) 16*x *atan (2*x)| 48*|-------- - atan (2*x) - -------------- + ----------------| | 2 2 2 | \1 + 4*x 1 + 4*x 1 + 4*x / -------------------------------------------------------------- 2 / 2\ \1 + 4*x /