/ / 2 \ \
| | 3 4*x 6*x | |
| |-1 + ----------------- + ------ - ----------------|*atan(x) / 1 \ |
| 2 | / 2\ 2 2 / 2\ | 3*|x - -------| |
| 4*x \ \1 + x /*acot (x) 1 + x \1 + x /*acot(x)/ 3*x \ acot(x)/ |
2*pi*|-1 + ------ + ------------------------------------------------------------ - ---------------- - ----------------|
| 2 acot(x) / 2\ / 2\ |
\ 1 + x \1 + x /*acot(x) \1 + x /*acot(x)/
-----------------------------------------------------------------------------------------------------------------------
2
/ 2\
\1 + x / *acot(x)