cot^(-1) (2^2+1/2)+cot^(-1) (2^3+1/2^2)+...

`cot^(-1) (2^2+1/2)+cot^(-1) (2^3+1/2^2)+cot^(-1)(2^4+1/2^3)+…… oo`

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cot^(-1) (2^2+1/2)+cot^(-1) (2^3+1/2^2)+cot^(-1)(2^4+1/2^3)+…… oo
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