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If ∫ − + dx 1 x 2 1 x = f(x) 1 x 2 − + C , where C is a constant of integration, then f(x) is equal to :

1. 3 2 (x – 4)
2. 3 1 (x + 4)
3. 3 1 (x + 1)
4. 3 2 (x + 2)

Correct answer: 3 1 (x + 4)

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