The sum of cot^(-1)((7)/(4))+cot^(-1)((1...

The sum of `cot^(-1)((7)/(4))+cot^(-1)((19)/(4))+cot^(-1)((39)/(4))+cot^(-1)((67)/(4))..... oo` is equal to :

A

`tan^(-1)4 `

B

`tan^(-1)3`

C

`tan^(-1)2`

D

None of these

Verified by Experts

The correct Answer is:

C

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