fre
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:2024/06/23 14:28:03
![](http://img.wesiedu.com/upload/1/e2/1e2db4410f9d2bde75dd492ec76891e2.jpg)
![fre](/uploads/image/z/19235117-29-7.jpg?t=fre)
解题思路: 题主要考查两角差的余弦公式,二倍角公式及半角公式的应用,考查归纳推理以及计算能力,属于中档题.
解题过程:
![](http://img.wesiedu.com/upload/b/a6/ba61381958af8dafc63242bf7a2cdd0e.jpg)
解题过程:
![](http://img.wesiedu.com/upload/b/a6/ba61381958af8dafc63242bf7a2cdd0e.jpg)
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