Use the result of Exercise 27 and the fact that x*)20 cos x dx ! 1 (from Exercise 25 in
Chapter 5, Problem 5.2.46(choose chapter or problem)
Use the result of Exercise 27 and the fact that x*)20 cos x dx ! 1 (from Exercise 25 in Section 5.1), together with the properties of integrals, to evaluate x*)20 !2 cos x % 5x" dx
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