/ 3 \ | x x 2*x | 2*|-atan(x) + --------- - --------- - ------| | 2 2 2| | / 2\ / 2\ 1 + x | \ \1 + x / \1 + x / /
/ 4 2 2 \ | 1 4*x 4*x 7*x | 2*|-3 - ------ - --------- + --------- + ------| | 2 2 2 2| | 1 + x / 2\ / 2\ 1 + x | \ \1 + x / \1 + x / / ------------------------------------------------ 2 1 + x