1.

Cot^(-1)3+Cot^(-1)7+Cot^(-1)13+……n terms =

Answer»

`TAN^(-1)(N/(n+2))`
`Tan^(-1)((n+2)/n)`
`"Tan"^(-1)(3N)/(4n+1)`
`Tan^(-1)((4n+1)/(3n))`

ANSWER :A


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