-8*acot(4*x) ------------ 2 1 + 16*x
32*(1 + 8*x*acot(4*x)) ---------------------- 2 / 2\ \1 + 16*x /
/ 2 \ | 12*x 64*x *acot(4*x) | 256*|- --------- - --------------- + acot(4*x)| | 2 2 | \ 1 + 16*x 1 + 16*x / ----------------------------------------------- 2 / 2\ \1 + 16*x /