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" 3) "P*Tquad 4cos12^(@)*cos48^(@)*cos72...

" 3) "P*Tquad 4cos12^(@)*cos48^(@)*cos72^(@)=cos36^(@)

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

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

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

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

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

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

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

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

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