(cos7°-cos8°cos15°)/(cos23°-cos8°cos15°)=
1.sin7°+cos15°sin8°/cos7°-sin15°cos8°=
求(sin8°+sin7°cos15°)/(cos8°-sin7°sin15°)的值
(sin7°+cos15°cos8°)/(sin7°-sin15°sin8°)的化简
关于三角函数的计算题(sin8°+sin7°cos15°)÷(cos8°-sin7°sin15°)=?
求cos15°-tan15°/cos15°+sin15°
tan15°+cos15°等于
计算tan15°+cos15°/cos75°
cos15°×sin75°的值为
化简COS8°-SIN17°SIN9°/COS9°
(cos15°-cos75°)(sin75°+sin15°)怎么化简?
cos75°cos15°+sin75°sin15°的值为( )
(cos15°-cos75°)(sin75°+sin15°)=?