The value of `cot sum_(n=1)^oo cot^(- 1)(2/(n^2)sum_(n=1)^n k^3)`

The value of cot (sum_(n=1)^(23) cot^(-1) (1 + sum_(k=1)^(n) 2k)) is

Find sum_(n=1)^(oo)cot^(-1)(2*n^(2))=

The value of cot(sum_(n=1)^(2)cot^(-1)(1+sum_(k=1)^(n)2k)) is (a) (23)/(25) (b) (25)/(23) (c) (23)/(24) (d) (25)/(26)

The value of cot sum_(n=1)^(19)(cot^(-1)(1+sum_(p=1)^(n)2p)) is equal to ( a )(21)/(19) (b) (19)/(21)(c)-(19)/(21) (d) -(21)/(19)

The value of sum_(n=1)^(oo)(4n-2)/(3^(n))

The value of sum sum_(n=1)^(oo)cot^(-1)(((n^(2)+2n)(n^(2)+2n+1)+1)/(2n+2)) is equal to

The value of sum_(n=1)^(oo)(1)/(2n(2n+1)) is equal to