1.

If a_(1),a_(2),a_(3),....,a_(n) is an A.P. with common difference d, then tan[Tan^(-1)(d/(1+a_(1)a_(2)))+Tan^(-1)(d/(1+a_(2)a_(3)))+...Tan^(-1)(d/(1+a_(n-1)a_(n)))=

Answer»

`((N-1)d)/(a_(1)+a_(n))`
`((n-1)d)/(1+a_(1)a_(n))`
`(ND)/(1+a_(1)a_(n))`
`(a_(n)-a_(1))/(a_(n)+a_(1))`

ANSWER :B


Discussion

No Comment Found