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" (iii) "4cos12^(@)cos48^(@)cos72^(@)=co...

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

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

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

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

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

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

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

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

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

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