从圆
外一点
向这个圆作两条切线,则两切线夹角的余弦为___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/748a3e242ac925262332d76585bcce29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e420127f7e81ac0fd6d03daca6f32a3.png)
18-19高三上·黑龙江牡丹江·期中 查看更多[2]
更新时间:2018-11-28 15:35:02
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【推荐2】已知直线
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