/ / 9 3 6 / 3\ 12 / 3\ \ \
| | 27*x 9*x 27*x *atan\x / 36*x *atan\x / / 3\| / 3 6 / 3\\|
| 6*|- --------- + ------ - -------------- + --------------- + atan\x /|*log(1 + x) | / 3\ 3*x 6*x *atan\x /||
| | 2 6 6 2 | 9*x*|2*atan\x / + ------ - -------------||
| 2/ 3\ | / 6\ 1 + x 1 + x / 6\ | 2 / 3\ | 6 6 ||
|atan \x / \ \1 + x / \1 + x / / 9*x *atan\x / \ 1 + x 1 + x /|
2*|--------- + --------------------------------------------------------------------------------- - ----------------- + -----------------------------------------|
| 3 6 2 / 6\ / 6\ |
\ (1 + x) 1 + x (1 + x) *\1 + x / (1 + x)*\1 + x / /