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The numerical value of cos 2pi/7 + cos 4...

The numerical value of `cos 2pi/7 + cos 4pi/7 + cos 6pi/7` is=........

A

`(1)/(2)`

B

0

C

`-(1)/(2)`

D

1

Text Solution

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The correct Answer is:
A, B
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Knowledge Check

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    A
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