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The sum of the series cot^-1 2 + cot^-1 ...

The sum of the series `cot^-1 2 + cot^-1 8 +cot^-1 18+cot^-1 32................`is

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The sum of the infinite series cot^-1 2+cot^-1 8+cot^-1 18+cot^-1 32+........ is equal to

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cot^-1 (21) + cot^-1(13) + cot^-1 (8) =