| x2 | ||
∫ | dx = przez części: | |
| (x2 + 1)2 |
| x | 1 | 1 | ||||
|v' = | , v = − | * | | | |||
| (x2 + 1)2 | 2 | x2 + 1 |
| x | 1 | 1 | x | 1 | ||||||
= − | + | ∫ | = − | + | arctgx + C | |||||
| 2(x2 + 1) | 2 | x2 + 1 | 2(x2 + 1) | 2 |
| 1 | x2 + 1 − x2 | |||
∫ | dx = ∫ | dx = | ||
| (x2 + 1)2 | (x2 + 1)2 |
| 1 | x2 | 1 | x | |||||
= ∫ | dx − ∫ | dx = | arctgx + | + C | ||||
| x2 + 1 | (x2 + 1)2 | 2 | 2(x2 + 1) |