1 . 如图,圆O的直径
,P是
延长线上一点,
,割线
交圆O于点C,D,过点P作
的垂线,交直线
于点E,交直线
于点F.
(1)求证:
;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a0367c3fe3c5c5dfefec87f641bbde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aaa89732b930eeaaf5067b352c0eff3.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c3f75d0069e85103809a2e4e9fc479.png)
![](https://img.xkw.com/dksih/QBM/2014/8/5/1571831925030912/1571831930806272/STEM/d58b62c827de431b9b1289aff3dcf0f3.png?resizew=147)
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2016-12-03更新
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4卷引用:2013-2014学年黑龙江省鹤岗一中高二下学期期末考试文科数学试卷
(已下线)2013-2014学年黑龙江省鹤岗一中高二下学期期末考试文科数学试卷2015届宁夏银川一中高三第一次模拟考试理科数学试卷2015届宁夏银川一中高三第一次模拟考试文科数学试卷(已下线)第五篇 向量与几何 专题2 圆幂定理与根轴 微点1 圆幂定理