cos7°cos23°-sin7°sin23°=?

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/20 20:29:48
cos7°cos23°-sin7°sin23°=?
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cos7°cos23°-sin7°sin23°=?
cos7°cos23°-sin7°sin23°=?

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