如图,已知正四棱锥ABCD-A`B`C`D`中,底面边长AB=2,侧棱BB`=4,过点B作B`C的垂线交侧棱CC`于点E,交B`C于点F.1.求证:A`C垂直于平面BDE.2.求A`B与平面BDE所成角的正弦值!
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![如图,已知正四棱锥ABCD-A`B`C`D`中,底面边长AB=2,侧棱BB`=4,过点B作B`C的垂线交侧棱CC`于点E,交B`C于点F.1.求证:A`C垂直于平面BDE.2.求A`B与平面BDE所成角的正弦值!](/uploads/image/z/14576397-69-7.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E6%AD%A3%E5%9B%9B%E6%A3%B1%E9%94%A5ABCD-A%60B%60C%60D%60%E4%B8%AD%2C%E5%BA%95%E9%9D%A2%E8%BE%B9%E9%95%BFAB%3D2%2C%E4%BE%A7%E6%A3%B1BB%60%3D4%2C%E8%BF%87%E7%82%B9B%E4%BD%9CB%60C%E7%9A%84%E5%9E%82%E7%BA%BF%E4%BA%A4%E4%BE%A7%E6%A3%B1CC%60%E4%BA%8E%E7%82%B9E%2C%E4%BA%A4B%60C%E4%BA%8E%E7%82%B9F.1.%E6%B1%82%E8%AF%81%EF%BC%9AA%60C%E5%9E%82%E7%9B%B4%E4%BA%8E%E5%B9%B3%E9%9D%A2BDE.2.%E6%B1%82A%60B%E4%B8%8E%E5%B9%B3%E9%9D%A2BDE%E6%89%80%E6%88%90%E8%A7%92%E7%9A%84%E6%AD%A3%E5%BC%A6%E5%80%BC%21)
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