cos_(84)

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

cos12^(@)+cos60^(@)+cos84^(@)=cos24^(@)+cos48

Find the value of cos12^(@)+cos84^(@)+cos156^(@)+cos132^(@)

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

Find the value of cos12^(@)+cos84^(@)+cos156^(@)+cos132^(@) .

The value of cos12^@+cos84^@+cos156^@+cos132^@ is

The value of cos12^(@)+cos84^(@)+cos156^(@)+cos132^(@) is

The value of cos12^(@)+cos84^(@)+cos156^(@)+cos132^(@) is

sin21^(@)cos9^(@)-cos84^(@) cos6^(@)=