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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

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

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