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sum(k=1)^(13)(1)/(sin((pi)/(4)+((k-1)pi)...

`sum_(k=1)^(13)(1)/(sin((pi)/(4)+((k-1)pi)/(6))sin((pi)/(4)+(kpi)/(6)))` का मान है

A

`3- sqrt3`

B

`2(3- sqrt3)`

C

`2(sqrt3-1)`

D

`2(2+ sqrt3)`

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