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解题方法
1 . 已知抛物线C:
的焦点到准线的距离为2,圆M与y轴相切,且圆心M与抛物线C的焦点重合.
(1)求抛物线C和圆M的方程;
(2)设
为圆M外一点,过点P作圆M的两条切线,分别交抛物线C于两个不同的点
,
和点
,
,且
.证明:点P在一条定曲线上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
(1)求抛物线C和圆M的方程;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6502f80a31bfffe5dfdb2f6ffe5ef2c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d14d14310aaf4630c169e8d7b2a9cf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34494f6910d4e081d89d1136c8cdff4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43f0f4943e96860f1043fbdd9588531b.png)
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