作业帮sin22°+cos30°sin8°/sin22°-sin30°sin8°=?
来源：学生作业帮助网 编辑：作业帮 时间：2024/08/06 18:28:06
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sin22°+cos30°sin8°/sin22°-sin30°sin8°=?
sin22°+cos30°sin8°/sin22°-sin30°sin8°=?
sin22°+cos30°sin8°/sin22°-sin30°sin8°=?
题目应该是
sin22°+ cos30°sin8°
_______________________
cos22°- sin30°sin8°
sin22`=sin(30`-8`)=sin30`*cos8`-cos30`*sin8`
sin22°+ cos30°sin8°=sin30`*cos8`
cos22`=cos(30`-8`)=sin30`*sin8`+cos30`*cos8`
cos22°- sin30°sin8°=cos30`*cos8`
分子除以分母得：sin30`*cos8`/cos30`*cos8`=sin30`/cos30`=根号3除以3