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21. Evaluate the indefinite integral. xcos9x dx - X a. sin9x + 81 -cos9x + C X b. cos9x + 81 sin9x + C X

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21. Evaluate the indefinite integral. xcos9x dx - X a. sin9x + 81 -cos9x + C X b. cos9x + 81 sin9x + C X C. cos9x + 9 sin9x + C X d. 81 cos9x + sin9x + C e. None of these22. Set up, but do not evaluate, an integral for the area of the surface ebtained by rotating the curve about the given axis

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