sin7°+cos15°sin8°/cos7°-sin15°sin8°求值.是上面整体除下面整体
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/27 13:47:22
![sin7°+cos15°sin8°/cos7°-sin15°sin8°求值.是上面整体除下面整体](/uploads/image/z/3712925-29-5.jpg?t=sin7%C2%B0%2Bcos15%C2%B0sin8%C2%B0%2Fcos7%C2%B0-sin15%C2%B0sin8%C2%B0%E6%B1%82%E5%80%BC.%E6%98%AF%E4%B8%8A%E9%9D%A2%E6%95%B4%E4%BD%93%E9%99%A4%E4%B8%8B%E9%9D%A2%E6%95%B4%E4%BD%93)
x)+3?A;9 } (!mlzڰGٌOvt-ON~9sɓpMR>F50WΆR @tBM
E
b-jӴ*ՆagÓKu^N_rь6>_w]m:Ϻ |6MXtDzg?dg }`#cQ-IX_\g
6
sin7°+cos15°sin8°/cos7°-sin15°sin8°求值.是上面整体除下面整体
sin7°+cos15°sin8°/cos7°-sin15°sin8°求值.
是上面整体除下面整体
sin7°+cos15°sin8°/cos7°-sin15°sin8°求值.是上面整体除下面整体
sin7°=sin(15°-8°)=sin15°cos8°-cos15°sin8°
cos7°=cos(15°-8)=cos8°cos15°+sin8°sin15°
所以,问题就简单了,把上面写的那个带进去之后
得到sin15°cos8°/cos8°cos15°=tan15°