The value of underset (nrarrinfty)(lim)(...

The value of `underset (nrarrinfty)(lim)("sin"(pi)/(2n)."sin"(2pi)/(2n)."sin"(3pi)/(2n)..."sin"((n-1)pi)/(n))^(1//n)` is equal to

`1/2`

`1/3`

`1/4`

`3/4`

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