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