(20°的余弦值)×(40°的余弦值)×(60°的余弦值)×(80°的...(20°的余弦值)×(40°的余弦值)×(60°的余弦值)×(80°的余弦值)=?怎么算的?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/29 19:17:50
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