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2cos ""(pi)/(13)cos""(9pi)/(13)+cos""(3p...

`2cos ""(pi)/(13)cos""(9pi)/(13)+cos""(3pi)/(13)+cos""(5pi)/(13)=0`

A

`-1`

B

0

C

1

D

`1/2`

Text Solution

Verified by Experts

The correct Answer is:
B
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