有图A为圆O直径上的一点,B为圆上任意一点,求证:当AB与圆O相切时,∠BAO最大.
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![有图A为圆O直径上的一点,B为圆上任意一点,求证:当AB与圆O相切时,∠BAO最大.](/uploads/image/z/9310422-30-2.jpg?t=%E6%9C%89%E5%9B%BEA%E4%B8%BA%E5%9C%86O%E7%9B%B4%E5%BE%84%E4%B8%8A%E7%9A%84%E4%B8%80%E7%82%B9%2CB%E4%B8%BA%E5%9C%86%E4%B8%8A%E4%BB%BB%E6%84%8F%E4%B8%80%E7%82%B9%2C%E6%B1%82%E8%AF%81%EF%BC%9A%E5%BD%93AB%E4%B8%8E%E5%9C%86O%E7%9B%B8%E5%88%87%E6%97%B6%2C%E2%88%A0BAO%E6%9C%80%E5%A4%A7.)
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