当
,且
,
时,
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7c146ff0411e4ed5650891491a1e888.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5034817cc7e4b440714994ed9e4875ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45a173784888adf2946382fa093ba53a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9edd79e243e723b276a1d4040249e95e.png)
更新时间:2022-08-19 14:55:04
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【知识点】 用和、差角的正切公式化简、求值解读