72 x 864*x*atan(6*x) - ------------ + --------- + --------------- 2 2 2 / 2\ / 2\ / 2\ \1 + 36*x / \1 + x / \1 + 36*x /
2 2 1 4*x 864*atan(6*x) 15552*x 124416*x *atan(6*x) --------- - --------- + ------------- + ------------ - ------------------- 2 3 2 3 3 / 2\ / 2\ / 2\ / 2\ / 2\ \1 + x / \1 + x / \1 + 36*x / \1 + 36*x / \1 + 36*x /