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If f(x) = ∫ + + + dx ) x 2 1 x ( x 7 x 5 2 7 2 6 8 , (x ≥ 0), and f(0) = 0, then the value of f

1. is :
2. – 2 1
3. – 4 1
4. 4 1 (4) 2 1

Correct answer: – 4 1

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