1 . 在平面直角坐标系中,动点M到点
的距离比到点
的距离大2,记点M的轨迹为曲线H.
(1)若过点B的直线交曲线H于不同的两点,求该直线斜率的取值范围;
(2)若点D为曲线H上的一个动点,过点D与曲线H相切的直线与曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8961be6a63ff90a1404772abcb435bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
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解题方法
2 . 在三棱锥
中,
,
,
,
,且
,则二面角
的余弦值的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5064f5ce5ac8428e277fd578da84ec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc869db22586a339bb68822e90fb01a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c23a59961c158d6ea65a0ec4db77ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e4b16c2c6c9bd089da78122e9d2511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d294d69caac577339f11f477b2047e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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