1.

If S_(n)=cot^(-1)(3)+cot^(-1)(7)+cot^(-1)(13)+cot^(-1)(21)+….. n terms, then

Answer»

`S_(10)=TAN^(-1)""5/6`
`S_(infty)=pi/4`
`S_(6)=sin^(-1)""4/5`
`S_(20)=cot^(-1)1.1`

Answer :A::B::D


Discussion

No Comment Found