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

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

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

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

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

Prove that: \ cos7^0cos 14^0cos 28^0cos 56^0=(sin 68^0)/(16cos83^0)

Prove that: cos 80^0+cos 40^0-cos 20^0=0

Prove that: cos 80^0+cos 40^0-cos 20^0=0

Prove that: cos 80^0+cos 40^0-cos 20^0=0

Prove that: cos20^0cos40^0cos60^0cos80^0=1/(16)

Prove that : cos 20^0cos 40^0cos 60^0cos 80^0=1/(16)

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