式子cos9°-sin9°/sin18°cos18°的值是?

式子cos9°-sin9°/sin18°cos18°的值是? sin21°cos9°+cos21°sin9°=? cos39°cos9°+sin39°sin9°= cos51°cos9°-cos39°sin9°= 化简COS8°-SIN17°SIN9°/COS9° 化简COS8°-SIN17°SIN9°/COS9° 4（sin18°）平方+4（cos36°）平方4sin²18°+4cos²36°=4sin²18°+4(1-sin²36°)=4-4(sin²36°-sin²18°)=4-4(sin36°+sin18°)(sin36°-sin18°)=4-4*2sin27°cos9°*2cos27°sin9°=4-4*(2sin27°cos27°)*(2sin9°cos9°)=4- 求值:(sin9°+sin6°cos15°)/(cos9°-sin6°sin15°)怎么做? 过程! 计算：(sin9°+cos15°sin6°)÷(cos9°-sin15°sin6°) 计算三角函数(和角公式)sin9°+sin6°cos15°/cos9°-sin6°sin15° 化简（sin15°cos9°-cos66°）/（sin15°sin9°+sin66°）的结果是?如上. sin9+cos15sin6/cos9-sin15sin6 sin18°cos36° sin18°×cos32° sin18°=? 不查表求sin18° sin9°57.6等于多少? 求值：sin18°*sin54°