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[" (13.) "cot^(-1)(ab+1)/(a-b)+cot^(-1)(...

[" (13.) "cot^(-1)(ab+1)/(a-b)+cot^(-1)(bc+1)/(b-c)+cot^(-1)(ca+1)/(c-a)=],[[" (A) "-pi," (B) "pi],[" (C) "0," (D) "xi+H#" and "(1)/(2)]]

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