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If ∫ x 0 dt ) t ( f = x 2 + ∫ 1 x 2 dt ) t ( f t then f ′ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 2 1 is -

1. 25 18
2. 25 6
3. 25 24
4. 5 4

Correct answer: 25 24

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