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4cos12^(@)cos48^(@)cos72^(@)=cos36^(@)...

4cos12^(@)cos48^(@)cos72^(@)=cos36^(@)

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

cos48^(@)*cos12^(@)=

cos48^(@)*cos12^(@)=

cos36^(@)-cos72^(@)=

The value of cos12^(@)cos24^(@)cos36^(@)cos48^(@)cos72^(@)cos84^(@), is

The value of cos12^(@)cos24^(@)cos36^(@)cos48^(@)cos72^(@)cos84^(@), is

cos12^(@)cos24^(@)cos48^(@)cos84^(@)

cos6^(@)sin24^(@)cos72^(@)=

4 cos 12 ^(@) cos 48^(@) cos 72^(@) = cos 36 ^(@)