cos7°cos23°-sin7°sin23°=?

来源：学生作业帮助网编辑：六六作业网时间：2024/12/22 21:30:49

cos7°cos23°-sin7°sin23°=?cos7°cos23°-sin7°sin23°=?cos7°cos23°-sin7°sin23°=?=cos(7°+23°)=cos30°=√3/2

cos7°cos23°-sin7°sin23°=?
cos7°cos23°-sin7°sin23°=?

cos7°cos23°-sin7°sin23°=?
=cos(7°+23°)=cos30°=√3/2