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If y = tan^(-1) ((1)/(1 + x + x^(2))) + ...

If `y = tan^(-1) ((1)/(1 + x + x^(2))) + tan^(-1) ((1) /(x^(2) + 2x + 3)) + tan^(-1) ((1)/(x^(2) + 5x + 7))` + ….n terms , then y(0) is

A

`- (n^(2))/(1 + n^(2))`

B

`(pi)/(2)`

C

`(2n)/(1 + n^(2))`

D

`(n^(2))/(1 + n^(2))`

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