" 21."lim_(n rarr oo)sum_(r=1)^(n)cot^(-1)(r^(2)+r+1)=

lim_(n to oo)sum_(r=1)^(n)cot^(-1)(r^(2)+3//4) is

lim_(n rarr oo) sum_(r=0)^(n-1) 1/(n+r) =

The value of the lim_(n rarr oo)tan{sum_(r=1)^(n)tan^(-1)((1)/(2r^(2)))}_( is equal to )

lim_(n rarr oo) n.sum_(r=0)^(n-1) 1/(n^(2)+r^(2)) =

"lim_(n rarr oo)(1)/(n){sum_(r=1)^(n)e^((r)/(n))}=

Let L=lim_(n rarr oo)sum_(r=1)^(n)tan^(-1)((1)/(2^(r+1)+(1)/(2^(g)))) then the value of cot L is equal to ])

Lt_(n rarr oo)sum_(r=0)^(n-1)((r)/(n^(2) + r^(2)))