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If ∫ − dx e . x 3 x 4 5 = 3 x 4 e 48 1 − f(x) + C, where C is a constant of integration, then f(x) is equal to -

1. –2x 3 – 1
2. – 2x 3 + 1
3. 4x 3 + 1
4. –4x 3 – 1

Correct answer: –4x 3 – 1

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