In Exercises 4144, Calculate '(x) in terms of P(x), Q(x), and R(x), assuming that P'(x) = Q(x),

In Exercises 41–44, Calculate ƒ'(x) in terms of P(x), Q(x), and R(x), assuming that P'(x) = Q(x), Q'(x) = −R(x), and R'(x) = P(x).

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f(x) = P(x) Q(x) X