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Let f : [1, ∞ ) → [2, ∞ ) be a differentiable function. If 10 ∫ x 1 dt ) t ( f = 5xf(x) – x 5 – 9 for all x ≥ 1, then the value of f

1. is :
2. 26
3. 32
4. 18 (4) 22

Correct answer: 26

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