The value of underset(n rarroo)(lim)sum(...

The value of `underset(n rarroo)(lim)sum_(r=1)^(n)(1)/(sin{((n+r)pi)/(4n)}).(pi)/(n) ` is equal to

A

`2ln(sqrt(2)-1)`

B

`4ln(sqrt(2)-1)`

C

`4ln(sqrt(2)+1)`

D

`lnsqrt(2)`

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