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