1.

The value of "tan"^(-1)4/7+"tan"^(-1)4/19+"tan"^(-1)4/39+"tan"^(-1)4/67……..oo equals

Answer»

`(pi)/2-tan^(-1)""1/2`
`tan^(-1)1+COT^(-1)3`
`cot^(-1)1+cot^(-1)""1/2+cot^(-1)""1/3`
`cot^(-1)1+tan^(-1)3`

ANSWER :B


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