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