Question: Let and g be functions whose first and second derivatives exist on an interval I. Which of the following formulas is (are) true? (a)

Let ƒ and g be functions whose first and second derivatives exist on an interval I. Which of the following formulas is (are) true?

(a) ƒg" - ƒ"g = (ƒg'- ƒ'g)' 

(b) ƒg" + ƒ"g = (ƒg)"

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