For items 13, 14, and 15, consider the region R bounded by y = Arctan , r = 1, and the z-axis. Suppose that R has its centroid at (7,5). 13. F is equal to Arctan zdr A. C. Arctan a dr (1-tan y) dy 25/(1-tan y) dy (1-tan² y) dy 2 √(1-tan y) dy (Arctan z)² da B. D. 2 Arctan z dz OA OB OC D 2 12

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