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The expression sum(n=1)^(oo)cot^(-1)(n^(...

The expression `sum_(n=1)^(oo)cot^(-1)(n^(2)-3n+3)` simplifies to

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Find sum_(n=1)^(oo)cot^(-1)(2*n^(2))=

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lim_(n to oo)sum_(r=1)^(n)cot^(-1)(r^(2)+3//4) is

The value of sum_(n=1)^(oo)(4n-2)/(3^(n))