cos7°-sin15°sin8°/cos8°
1.sin7°+cos15°sin8°/cos7°-sin15°cos8°=
(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(sin8°+sin7°cos15°)/(cos8°-sin7°sin15°)的值
sin15°
求(sin7度+cos15度sin8度)/(cos7度-sin15度sin8度)的值
化简(cos⁴7°30′-sin⁴7°30′)(sin23°cos8°-sin67°sin8°)
sin15°乘sin75°
sin15°sin75°=?
sin15°+cos165°=
sin15°+sin75°=?
化简COS8°-SIN17°SIN9°/COS9°