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" Find the sum "cot^(-1)2+cot^(-1)8+cot^...

" Find the sum "cot^(-1)2+cot^(-1)8+cot^(-1)18+dots oo

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Find the sum cot^(-1) 2 + cot^(-1) 8 + cot^(-1) 18 + ...oo

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