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Find the value of cos 18^(@)...

Find the value of `cos 18^(@)`

A

`1/8 (5-sqrt(5))`

B

`(1)/(2sqrt(2))sqrt(5+sqrt(5))`

C

`(sqrt(5)-1)/(4)`

D

`(sqrt(5)+1)/(4)`

Text Solution

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The correct Answer is:
B
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