△ABC内接于圆O,AB=6,AC=4,D是AB边上一点,P是优弧BAC的中点,连接PA、PB、PC、PD高手进来吧!(1)当BD的长度为多少时,△PAD是以AD为底边的等腰三角形,请证明.(2)若cos∠PCB=根号5/5,求PA的长
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![△ABC内接于圆O,AB=6,AC=4,D是AB边上一点,P是优弧BAC的中点,连接PA、PB、PC、PD高手进来吧!(1)当BD的长度为多少时,△PAD是以AD为底边的等腰三角形,请证明.(2)若cos∠PCB=根号5/5,求PA的长](/uploads/image/z/8600800-40-0.jpg?t=%E2%96%B3ABC%E5%86%85%E6%8E%A5%E4%BA%8E%E5%9C%86O%2CAB%3D6%2CAC%3D4%2CD%E6%98%AFAB%E8%BE%B9%E4%B8%8A%E4%B8%80%E7%82%B9%2CP%E6%98%AF%E4%BC%98%E5%BC%A7BAC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E8%BF%9E%E6%8E%A5PA%E3%80%81PB%E3%80%81PC%E3%80%81PD%E9%AB%98%E6%89%8B%E8%BF%9B%E6%9D%A5%E5%90%A7%21%EF%BC%881%EF%BC%89%E5%BD%93BD%E7%9A%84%E9%95%BF%E5%BA%A6%E4%B8%BA%E5%A4%9A%E5%B0%91%E6%97%B6%2C%E2%96%B3PAD%E6%98%AF%E4%BB%A5AD%E4%B8%BA%E5%BA%95%E8%BE%B9%E7%9A%84%E7%AD%89%E8%85%B0%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E8%AF%B7%E8%AF%81%E6%98%8E.%EF%BC%882%EF%BC%89%E8%8B%A5cos%E2%88%A0PCB%3D%E6%A0%B9%E5%8F%B75%2F5%2C%E6%B1%82PA%E7%9A%84%E9%95%BF)
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