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cos 12^(circ)+cos 84^(circ)+cos 156^(cir...

`cos 12^(circ)+cos 84^(circ)+cos 156^(circ)+cos 132^(circ)=`

A

`(1)/(2)`

B

`(1)/(4)`

C

`-(1)/(4)`

D

`-(1)/(2)`

Text Solution

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