sin(6°)cos(12°)cos(24°)cos(48°)
=sin6°·cos6°·cos12°·cos24°·cos48°／cos6°
=sin12°·cos12°·cos24°·cos48°／2cos6°
=sin24°·cos24°·cos48°／4cos6°
=sin48°·cos48°／8cos6°
=sin96°／16cos6°
=sin（180°-96°）／16cos6°
=sin84°／16cos6°
=1／16