cos12^(0)+cos84^(0)+cos132^(0)+cos156^(0)

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

Prove that cos12^(@)+cos84^(@)+cos132^(@)+cos156^(@)=-1/2

A=sin78^(@)-sin18^(@)+cos132^(@) B=cos12^(@)+cos84^(@)+cos132^(@)+cos156^(@) and C=(sin 75^(@)+sin 15^(@))/(cos 75^(@)+cos 15^(@)) then arrange in the ascending order

A.78^(@)-sin18^(@)+cos132^(@),B=cos12^(@)+cos84^(@)+cos132^(@)+cos156^(@) and C=(sin75^(@)+sin15^(@))/(cos75^(@)+cos15^(@)) then arrang in the ascending order

Prove that: 4cos12^(0)cos48^(0)cos72^(0)=cos36^(@)

The value of cos12^(0)+cos84^(0)+cos156^(@)+cos132^(@)is

The value of cos12^(0)+cos84^(@)+cos156^(@)+cos132^(0) is (1)/(2)1-(1)/(2)(1)/(8)

Find the value of cos12^(0)+cos84^(@)+cos156^(@)+cos132^(@)

Prove that: cos7^(0)cos14^(0)cos28^(0)cos56^(@)=(s in68^(0))/(16cos83^(@))