(2009•深圳一模)如 图所示,AB为圆O的直 径,点E、F在圆O上,AB∥EF,矩形ABCD所 在平面和圆O所在的平 面互相垂直.已知AB=2,EF=1 (1)求证:平面DAF⊥平面CBF; (2)求直线AB与平面CBF所成角的
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![(2009•深圳一模)如 图所示,AB为圆O的直 径,点E、F在圆O上,AB∥EF,矩形ABCD所 在平面和圆O所在的平 面互相垂直.已知AB=2,EF=1 (1)求证:平面DAF⊥平面CBF; (2)求直线AB与平面CBF所成角的](/uploads/image/z/10991219-59-9.jpg?t=%EF%BC%882009%26%238226%3B%E6%B7%B1%E5%9C%B3%E4%B8%80%E6%A8%A1%EF%BC%89%E5%A6%82+%E5%9B%BE%E6%89%80%E7%A4%BA%2CAB%E4%B8%BA%E5%9C%86O%E7%9A%84%E7%9B%B4+%E5%BE%84%2C%E7%82%B9E%E3%80%81F%E5%9C%A8%E5%9C%86O%E4%B8%8A%2CAB%E2%88%A5EF%2C%E7%9F%A9%E5%BD%A2ABCD%E6%89%80+%E5%9C%A8%E5%B9%B3%E9%9D%A2%E5%92%8C%E5%9C%86O%E6%89%80%E5%9C%A8%E7%9A%84%E5%B9%B3+%E9%9D%A2%E4%BA%92%E7%9B%B8%E5%9E%82%E7%9B%B4%EF%BC%8E%E5%B7%B2%E7%9F%A5AB%3D2%2CEF%3D1+%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9A%E5%B9%B3%E9%9D%A2DAF%E2%8A%A5%E5%B9%B3%E9%9D%A2CBF%EF%BC%9B+%EF%BC%882%EF%BC%89%E6%B1%82%E7%9B%B4%E7%BA%BFAB%E4%B8%8E%E5%B9%B3%E9%9D%A2CBF%E6%89%80%E6%88%90%E8%A7%92%E7%9A%84)
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