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cot(pi/12) + cot((3pi)/12) + cos ((9pi)/...

`cot(pi/12) + cot((3pi)/12) + cos ((9pi)/12)+ cos ((11pi)/12)`

A

`cos 2 pi`

B

`cos pi`

C

`cos""(2)/(pi)`

D

`cos""(5pi)/(12)`

Text Solution

Verified by Experts

The correct Answer is:
C
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