1.

Sigma_(r=1)^(oo)tan^(-1) (2/((r +2))) is

Answer»

`pi - (TAN^(-1) 2 + tan ^(-1) 3) `
` pi/4`
` (7pi)/4`
` pi + ( tan^(-1) 2 + tan^(-1) 3)`

ANSWER :A::B


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