The value of sum(r=1)^(10)tan^(-1)(3/(9r...

The value of `sum_(r=1)^(10)tan^(-1)(3/(9r^2+3r-1))` is a)`cot^(-1)""13/6` b)`tan^(-1)""13/6` c)`cot^(-1)""14/5` d)`tan^(-1)""14/5`

A

`cot^(-1)""13/6`

B

`tan^(-1)""13/6`

C

`cot^(-1)""14/5`

D

`tan^(-1)""14/5`

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The correct Answer is:

A

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