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" 10.Prove that "4cos12^(@)cos48^(@)cos7...

" 10.Prove that "4cos12^(@)cos48^(@)cos72^(@)=cos36^(@)

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

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

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

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

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

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

Prove that: 4"cos"12^0cos48^0cos72^0=cos36^0

Prove that: i) cos10^(@)cos30^(@)cos50^(@)cos70^(@)=3/16 ii) cos20^(@)cos40^(@)cos60^(@)cos80^(@)=1/16 iii) 4cos12^(@)cos48^(@)cos72^(@)=cos36^(@) iv) cos40^(@) cos80^(@)cos160^(@)=-1/8

Prove that: i) cos10^(@)cos30^(@)cos50^(@)cos70^(@)=3/16 ii) cos20^(@)cos40^(@)cos60^(@)cos80^(@)=1/16 iii) 4cos12^(@)cos48^(@)cos72^(@)=cos36^(@) iv) cos40^(@) cos80^(@)cos160^(@)=-1/8