1.

If x_(1),x_(2),x_(3) are the roots of x^(3)-6x^(2)+11x-6=0 then cot^(-1)(x_(1))+cot^(-1)(x_(2))+cot^(-1)(x_(3)) is equal to

Answer»

0
`(PI)/(2)`
`pi`
`(3PI)/(2)`

Answer :B


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