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14cos12∘cos24∘cos36∘cos48∘cos72∘cos84∘= ?\frac{1}{4\cos{12^\circ}\cos{24^\circ}\cos{36^\circ}\cos{48^\circ}\cos{72^\circ}\cos{84^\circ}} = \, ? 4cos12∘cos24∘cos36∘cos48∘cos72∘cos84∘1=?
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