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The expression 2"cos"pi/13+"cos"(9pi)/1...

The expression
`2"cos"pi/13+"cos"(9pi)/13+"cos"(3pi)/13+"cos"(5pi)/13` is equal to :

A

-1

B

0

C

1

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
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