△ABC内接于圆心O,AB是圆心O的直径,点D在圆心O上,过点C的切线交AD的延长线于点E,且AE垂直,连接CE、CD(1)求证:DC=BC.(2)若AB=5,AC=4,求tan角DCE的值.不好意思哦.我发不到图呀!题目就是三角形ABC
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![△ABC内接于圆心O,AB是圆心O的直径,点D在圆心O上,过点C的切线交AD的延长线于点E,且AE垂直,连接CE、CD(1)求证:DC=BC.(2)若AB=5,AC=4,求tan角DCE的值.不好意思哦.我发不到图呀!题目就是三角形ABC](/uploads/image/z/2504104-16-4.jpg?t=%E2%96%B3ABC%E5%86%85%E6%8E%A5%E4%BA%8E%E5%9C%86%E5%BF%83O%2CAB%E6%98%AF%E5%9C%86%E5%BF%83O%E7%9A%84%E7%9B%B4%E5%BE%84%2C%E7%82%B9D%E5%9C%A8%E5%9C%86%E5%BF%83O%E4%B8%8A%2C%E8%BF%87%E7%82%B9C%E7%9A%84%E5%88%87%E7%BA%BF%E4%BA%A4AD%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8E%E7%82%B9E%2C%E4%B8%94AE%E5%9E%82%E7%9B%B4%2C%E8%BF%9E%E6%8E%A5CE%E3%80%81CD%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9ADC%3DBC.%EF%BC%882%EF%BC%89%E8%8B%A5AB%3D5%2CAC%3D4%2C%E6%B1%82tan%E8%A7%92DCE%E7%9A%84%E5%80%BC.%E4%B8%8D%E5%A5%BD%E6%84%8F%E6%80%9D%E5%93%A6.%E6%88%91%E5%8F%91%E4%B8%8D%E5%88%B0%E5%9B%BE%E5%91%80%21%E9%A2%98%E7%9B%AE%E5%B0%B1%E6%98%AF%E4%B8%89%E8%A7%92%E5%BD%A2ABC)
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