| (x2+2)dx | ||
∫ | ||
| (x2−1)(x+1) |
| x2 + 2 | |
| (x − 1)(x + 1)2 |
| A | B | C | |||
+ | + | = | |||
| x − 1 | x + 1 | (x + 1)2 |
| A(x + 1)2 + B(x + 1)(x − 1) + C(x − 1) | |
| (x − 1)(x + 1)2 |
| 3 | ||
4A = 3 ⇒ A = | ||
| 4 |
| 3 | ||
−2C = 3 ⇒ C = − | ||
| 2 |
| 3 | 9 | 1 | |||
+ 3B + | = 6 / * | ||||
| 4 | 2 | 3 |
| 7 | ||
B = 2 − | ||
| 4 |
| 1 | ||
B = | ||
| 4 |
| 3 | dx | 1 | dx | 3 | dx | ||||||
∫ | + | ∫ | − | ∫ | |||||||
| 4 | x − 1 | 4 | x + 1 | 2 | (x + 1)2 |