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If ∫ ψ = ) x ( dx ) x ( f , then ∫ dx ) x ( f x 3 5 is equal to -

1. 3 1 x 3 ψ (x 3 ) – ∫ + ψ C dx ) x ( x 3 2
2. [ ] ∫ ψ − ψ dx ) x ( x ) x ( x 3 1 3 3 3 3 + C
3. [ ] ∫ ψ − ψ dx ) x ( x ) x ( x 3 1 3 2 3 3 + C
4. ∫ + ψ − ψ C dx ) x ( x 3 ) x ( x 3 1 3 3 3 3

Correct answer: 3 1 x 3 ψ (x 3 ) – ∫ + ψ C dx ) x ( x 3 2

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