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If f ( x ) = x 3 − x 2 f 

1. + xf 
2. − f 
3. , x  R , then
4. 2 f (0) − f (1) + f (3) = f (2) (2) f (3) − f ( 2) = f (1) (3) 3 f (1) + f (2) = f (3) (4) f (1) + f (2) + f (3) = f (0)

Correct answer: + xf 

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