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If Sn=cot^-1(3)+cot^-1(7)+cot^-1(13)+cot...

If `S_n=cot^-1(3)+cot^-1(7)+cot^-1(13)+cot^-1(21)+.....`, `n` terms, then

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If S_oo=cot^-1(3)+cot^-1(7)+cot^-1(13)+cot^-1(21)+..... , oo terms, then find the value

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