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The value of sum (k = 1)^(6) ( sin "" (...

The value of ` sum _(k = 1)^(6) ( sin "" ( 2 pi k)/( 7) - i cos "" ( 2 pi k)/( 7))` is

A

`-1`

B

0

C

`-i`

D

`i`

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The correct Answer is:
D
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