68. Let n be a positive integer. Show that omuzA (d) othe far (In x)"dx = x(ln x)" – n (In x)"- dx. | The formula given in Exercise 67 reduces the calculation of Sx" ex dx to the calculation of ſ x"-leax dx. The formula given in Exercise 68 reduces the calculation of ((In x)" dx to the calculation of [ (ln x)"-l dx. Formulas (such as these) which reduce the calculation of an expression inn to the calculation of the corresponding expression in n – 1 are called reduction formulas. O

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