5. a) If an antiderivative of f (x) is sin x X sin x + 1, what was f (x)? B) On a recent test Judy said that 2 cos x sin x dx = sin2 x + c. Elaine said that 2 cos x sin x dx = Cos2 x + c. I gave them both full-credit. How can both be correct if their answers are dierent? Did I make a mistake?
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