If 15∅ = π, so prove that cos∅cos2∅cos3∅cos4∅cos5∅cos6∅cos7∅ = 1 / 2⁷
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If 15∅ = π, so prove that cos∅cos2∅cos3∅cos4∅cos5∅cos6∅cos7∅ = 1 / 2⁷
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