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If , C e ) x ( f dx ) 1 x ( e ) 1 x ( x 2 x 2 + = + + ∫ where C is a constant, then 3 3 dx f d at x = 1 is equal to :

1. 4 3 −
2. 4 3
3. 2 3 −
4. 2 3

Correct answer: 4 3

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