cos2x cosπ/5+sin2x sinπ/5化简最详细的步骤?
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/16 23:15:49
cos2x cosπ/5+sin2x sinπ/5化简最详细的步骤?
![cos2x cosπ/5+sin2x sinπ/5化简最详细的步骤?](/uploads/image/z/15018715-19-5.jpg?t=cos2x+cos%CF%80%2F5%2Bsin2x+sin%CF%80%2F5%E5%8C%96%E7%AE%80%E6%9C%80%E8%AF%A6%E7%BB%86%E7%9A%84%E6%AD%A5%E9%AA%A4%3F)
两角差的余弦=cos(2x -π/5)
cos2x cosπ/5+sin2x sinπ/5化简最详细的步骤?
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