已知圆O的直径AB与弦CD相交于点E,CE=ED切线BF与弦AD的延长线交于点F,若圆O的直径为8,cosC=3/4 求线段AD CD的长在3:00之前
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![已知圆O的直径AB与弦CD相交于点E,CE=ED切线BF与弦AD的延长线交于点F,若圆O的直径为8,cosC=3/4 求线段AD CD的长在3:00之前](/uploads/image/z/2503487-47-7.jpg?t=%E5%B7%B2%E7%9F%A5%E5%9C%86O%E7%9A%84%E7%9B%B4%E5%BE%84AB%E4%B8%8E%E5%BC%A6CD%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9E%2CCE%3DED%E5%88%87%E7%BA%BFBF%E4%B8%8E%E5%BC%A6AD%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%A4%E4%BA%8E%E7%82%B9F%2C%E8%8B%A5%E5%9C%86O%E7%9A%84%E7%9B%B4%E5%BE%84%E4%B8%BA8%2CcosC%3D3%2F4+%E6%B1%82%E7%BA%BF%E6%AE%B5AD+CD%E7%9A%84%E9%95%BF%E5%9C%A83%EF%BC%9A00%E4%B9%8B%E5%89%8D)
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