/ 3 2 3 2 2 3 2 4 2 \ 2
| 3*x 3*x 7*x *atan(x) 6*x *atan (x) 2*x *atan (x) 3*x *atan(x) 4*x *atan(x) 6*x*atan (x)| atan (x)
4*|3*atan(x) - --------- + ------ - ------------ - ------------- + ------------- + ------------ + ------------ + ------------|*e
| 2 2 2 2 2 2 2 2 |
| / 2\ 1 + x 1 + x / 2\ / 2\ / 2\ / 2\ 1 + x |
\ \1 + x / \1 + x / \1 + x / \1 + x / \1 + x / /
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2
1 + x