" 9."cot[sum_(n=1)^(23)cot^(-1){1+sum_(k=1)^(n)(2k)}]" The value of "

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

The value of cot(sum_(n=1)^(23)cot^-1(1+sum_(k=1)^n2k)) is

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

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