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{:(" " Lt),(n rarroo):} (pi)/(2n) (1+ c...

`{:(" " Lt),(n rarroo):} (pi)/(2n) (1+ cos. (pi)/(2n)+....+cos. ((n-1)pi)/(2n))=`

A

-1

B

1

C

`- 1/2`

D

`1/2`

Text Solution

Verified by Experts

The correct Answer is:
B
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