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