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P(x)=(x- cos 36^@ )(x -cos 84^@)(x -cos ...

`P(x)=(x- cos 36^@ )(x -cos 84^@)(x -cos 156^@ )` The coefficient of `x^2` is

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

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

cos 12^@ + cos 84^@ + cos 132^(@) + cos 156^(@)=

cos 3x + cos x - cos 2x =0

cos 3x + cos x - cos 2x =0

cos 3x + cos x - cos 2x =0

cos 3x + cos x - cos 2x =0

cos 3x + cos x -2 cos x =0

cos12^(@)+cos84^(@)+cos132^(@)+cos156^(@)=

cos 3x+cos x-cos 2x=0