如图,BD为圆O的直径,A为弧BC的中点.AD交BC于点E,过D作圆O的切线,交BC的延长线于F.求证:1.DF=EF;2.AE=2,DE=4,求DB的长.
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![如图,BD为圆O的直径,A为弧BC的中点.AD交BC于点E,过D作圆O的切线,交BC的延长线于F.求证:1.DF=EF;2.AE=2,DE=4,求DB的长.](/uploads/image/z/5204627-35-7.jpg?t=%E5%A6%82%E5%9B%BE%2CBD%E4%B8%BA%E5%9C%86O%E7%9A%84%E7%9B%B4%E5%BE%84%2CA%E4%B8%BA%E5%BC%A7BC%E7%9A%84%E4%B8%AD%E7%82%B9.AD%E4%BA%A4BC%E4%BA%8E%E7%82%B9E%2C%E8%BF%87D%E4%BD%9C%E5%9C%86O%E7%9A%84%E5%88%87%E7%BA%BF%2C%E4%BA%A4BC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8EF.%E6%B1%82%E8%AF%81%EF%BC%9A1.DF%3DEF%3B2.AE%3D2%2CDE%3D4%2C%E6%B1%82DB%E7%9A%84%E9%95%BF.)
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