cos 15^(@)...

`cos 15^(@)`

A

`sqrt((1+ cos 30^(@))/(2))`

B

`sqrt((1- cos 30^(@))/(2))`

C

`pm sqrt((1+ cos 30^(@))/(2))`

D

`pm sqrt((1- cos 30^(@))/(2))`

Verified by Experts

The correct Answer is:

A

cos 15^(@)
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