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[," (A) "8," (B) "16," (C) "2," (D) "4],[" 8.",f(x)=tan^(-1)x-x_(3)" is "......,,],[," U) increasing on "R," (B) "" decreasing on "R],[," (C) increasing on "R^(+),," (D) increasing on "(-oo,0)],[" 9.",f(x)=|x-1|+|x-2|" is increasing if ......",]

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