AB是圆O的直径,点D在AB的延长线上,BD=OB,点C在圆上,∠CAB=30°,求证:DC是圆O的切线两种不同的做法
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![AB是圆O的直径,点D在AB的延长线上,BD=OB,点C在圆上,∠CAB=30°,求证:DC是圆O的切线两种不同的做法](/uploads/image/z/11942175-39-5.jpg?t=AB%E6%98%AF%E5%9C%86O%E7%9A%84%E7%9B%B4%E5%BE%84%2C%E7%82%B9D%E5%9C%A8AB%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8A%2CBD%3DOB%2C%E7%82%B9C%E5%9C%A8%E5%9C%86%E4%B8%8A%2C%E2%88%A0CAB%3D30%C2%B0%2C%E6%B1%82%E8%AF%81%EF%BC%9ADC%E6%98%AF%E5%9C%86O%E7%9A%84%E5%88%87%E7%BA%BF%E4%B8%A4%E7%A7%8D%E4%B8%8D%E5%90%8C%E7%9A%84%E5%81%9A%E6%B3%95)
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