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Statement I sin((2pi)/(7))+sin((4pi)/(7)...

Statement I `sin((2pi)/(7))+sin((4pi)/(7))+sin((8pi)/(7))=- 1/2`.
Statement II `cos. (2pi)/(7)+I sin . (2pi)/(7)` is complex 7th root of unity.

A

Both Statement I and Statement II are individually true and R is the correct explanation of Statement I.

B

Both Statement I and Statement II are individually true but Statement II is not the correct explanaton of Statement I.

C

Statement I is true but Statement II is false.

D

Statement I is false but Statement II is true.

Text Solution

Verified by Experts

The correct Answer is:
D
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