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[" Q.6The value of "sum(r=2)^(oo)tan^(-1...

[" Q.6The value of "sum_(r=2)^(oo)tan^(-1)((1)/(r^(2)-5r+7))" ,is "],[[" (A) "(pi)/(4)," (B) "(pi)/(2)," (C) "4," (D) "(5 pi)/(4)]]

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