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Integration by parts says the integral of f g equals:
Af' * g' - int (f g)
Bint f * int g + f' g
Cf * int g - int (f' int g)
Dint f dx + int g dx
Answer & Solution
Correct answer: C. f * int g - int (f' int g)
Integration by parts reverses the product rule: integral of f g = f times integral g minus integral of f' times integral g.
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