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4 cos^(3)12^(@)-3sin78^(@)=...

`4 cos^(3)12^(@)-3sin78^(@)=`

A

`(sqrt5-1)/4`

B

`(sqrt5+1)/4`

C

`(sqrt(10-2sqrt5))/4`

D

`(sqrt(10+2sqrt5))/4`

Text Solution

Verified by Experts

The correct Answer is:
B
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