/ / 2 \ \
| | 3 4*x 6*x | |
| 2*|-1 + ----------------- + ------ - ----------------| / 1 \ |
| | / 2\ 2 2 / 2\ | 2 6*|x - -------|*log(7)|
x | 3 \ \1 + x /*acot (x) 1 + x \1 + x /*acot(x)/ 3*log (7) \ acot(x)/ |
7 *|log (7) + ------------------------------------------------------ + ---------------- - ----------------------|
| 2 / 2\ 2 |
| / 2\ \1 + x /*acot(x) / 2\ |
\ \1 + x / *acot(x) \1 + x / *acot(x) /
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acot(x)