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If C ) x 1 ( ) x ( xf ) x 1 ( x dx 3 1 6 3 / 2 6 3 + + = − ∫ where C is a constant of integration, then the function f(x) is equal to

1. 3 x 2 1 −
2. 2 x 3
3. 2 x 2 1 −
4. 3 x 6 1 −

Correct answer: 3 x 2 1 −

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