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The value of sin (pi)/(7)+sin (2 pi)/(7)...

The value of `sin (pi)/(7)+sin (2 pi)/(7)+sin (3 pi)/(7)` is

A

`cot (pi)/(14)`

B

`(1)/(2) cot (pi)/(14)`

C

`tan (pi)/(14)`

D

`(1)/(2) tan (pi)/(14)`

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