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cos(pi/14)+cos((3pi)/14)+cos((5pi)/14)=k...

`cos(pi/14)+cos((3pi)/14)+cos((5pi)/14)=kcot(pi/14)` then `k` is equal to

A

1

B

`1/2`

C

2

D

`-2`

Text Solution

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The correct Answer is:
B
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