cos10°sin40°-sin10°sin50°

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/28 13:06:48

cos10°sin40°-sin10°sin50°
cos10°sin40°-sin10°sin50°

cos10°sin40°-sin10°sin50°
cos10°sin40°-sin10°sin50°
=cos10°sin40°-sin10°cos40°
=sin(40-10)°
=sin30°
=1/2

cos10°sin40°-sin10°sin50°
=cos10°sin40°-sin10°cos40°
=sin(40-10)°
=sin30°
=1/2