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cos 12^@ + cos 84^@ + cos 132^(@) + cos ...

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

A

1

B

`1//2`

C

`-1//2`

D

`0`

Text Solution

Verified by Experts

The correct Answer is:
C
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 D ( TRANSFORMATIONS )
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