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P(x)=(x-cos36^@)(x-cos84^@)(x-cos156^@) ...

P(x)=`(x-cos36^@)(x-cos84^@)(x-cos156^@)` then coefficient of `x^2` is

A

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

B

`(sqrt(5)-1)/(16)`

C

`(sqrt(5)+1)/(16)`

D

`(1)/(16)`

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The correct Answer is:
B
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