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Sum the series, 'n' terms tan^(-1) 2/4 +...

Sum the series, 'n' terms `tan^(-1) 2/4 +tan^(-1) 2/9+tan^(-1) 2/16+ tan^(-1) 2/25+....` to 'n' terms. Also show that `S_(n)=tan^(-1)3`

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