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If f : R → R is a differentiable function and f

1. = 6, then ∫ − → ) x ( f 6 2 x ) 2 x ( dt t 2 lim is :
2. 0
3. 24 f '
4. (3) 12 f ' (2) (4) 2 f ' (2)

Correct answer: 24 f '

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