求值:(sin9°+sin6°cos15°)/(cos9°-sin6°sin15°)
求值:(sin9°+sin6°cos15°)/(cos9°-sin6°sin15°)
cos15°sin9°+sin6°/sin15°sin9°—cos6°=
sin6+cos15*sin9/cos6-sin15*sin9
求值(sin9°cos15°-sin24°)/(sin9°sin15°+cos24°)
化简(sin15°cos9°-cos66°)/(sin15°sin9°+sin66°)的结果是?
化简:(cos15度sin9度+sin6度)/(sin15度sin9度-cos6度)
化简COS8°-SIN17°SIN9°/COS9°
求cos15°-tan15°/cos15°+sin15°
sin6°sin42°sin66°sin78°=?
化简sin6°cos24°sin78°cos48°
sin6°sin42°sin66°sin78°=
(cos15°-cos75°)(sin75°+sin15°)=?