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If sum(r=1)^(10)tan^(-1)(3/(9r^(2)+3r-1)...

If `sum_(r=1)^(10)tan^(-1)(3/(9r^(2)+3r-1))=cot^(-1)(m/n)` (where m and n are coprime) then the value of `((2m+n))/8` is

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