5. proove that:4cos12 .cos48.cos72=cos36

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Prove that $4 c o s 12^{\circ} c o s 48^{\circ} c o s 72^{\circ} = 1 - 2 s i n^{2} 18^{\circ}$ .

cos 12 cos 24 cos 36 cos 48 cos 72 cos 96

cos 12^{\circ} cos 24^{\circ} cos 36^{\circ} cos 48^{\circ} cos 60^{\circ} cos 72^{\circ} cos 96^{\circ}

cos 12^{\circ} cos 24^{\circ} cos 36^{\circ} cos 48^{\circ} cos 72^{\circ} cos 84^{\circ}

cos 36^{\circ} - cos 72^{\circ} =

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