2. a. Use a computer algebra system to evaluate the following integrals. i. sin z cos 2x dx ii. sin 3x cos 7x dx ii. sin 8x cos 3x dx b. Based on the pattern of your responses in part (a), guess the value of the integral https://ng.cengage.com/static/nb/ui/evo/index.html?EISBN=9781337687737&id=339467405&snapshotld=877446&dockAppUid=101&nbld=877446& 1/3 7/21/2021 Print Preview sin ax cos bx dã c. Check your guess with a CAS. Then prove it by differentiation. For what values of a and b is it valid?

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