在双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176782512/SYS201310241830141767825019_ST/0.png)
中,F为右焦点,B为左顶点.点A在x轴正半轴上,且满足|OA|,|OB|,|OF|成等比数列.过F作C位于一、三象限内的渐近线的垂线,垂足为P.
(1)求证:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176782512/SYS201310241830141767825019_ST/1.png)
;
(2)若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176782512/SYS201310241830141767825019_ST/2.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176782512/SYS201310241830141767825019_ST/3.png)
,过点(0,-2)的直线l与双曲线C交于不同两点M与N,O为坐标原点.求
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176782512/SYS201310241830141767825019_ST/4.png)
的取值范围.
考点分析:
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