[" Ans."(3)^(x)],[" 13.The value of "cot(sum_(n=1)^(19)cot^(-1)(1+sum_(p=1)^(n)2p))" 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)^(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)^(oo)cot^(-1)((2)/(n^(2))sum_(n=1)^(n)k^(3))

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)