cos 12^(@) + cos 84^(@) + cos 156^(@) +...

`cos 12^(@) + cos 84^(@) + cos 156^(@) + cos 132^(@)` का मान है।

A

`1/2`

B

`1`

C

`-(1)/(2)`

D

`(1)/(8)`

लिखित उत्तर

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