如图,在四棱锥P-ABCD中,底面ABCD是矩形,且PA⊥平面ABCD,PA=AD=2,AB=1,BM⊥PD于点M.(1)求证AM⊥PD(2)求直线CD与平面ACM所成的角的余弦
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![如图,在四棱锥P-ABCD中,底面ABCD是矩形,且PA⊥平面ABCD,PA=AD=2,AB=1,BM⊥PD于点M.(1)求证AM⊥PD(2)求直线CD与平面ACM所成的角的余弦](/uploads/image/z/7098575-23-5.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%9B%9B%E6%A3%B1%E9%94%A5P-ABCD%E4%B8%AD%2C%E5%BA%95%E9%9D%A2ABCD%E6%98%AF%E7%9F%A9%E5%BD%A2%2C%E4%B8%94PA%E2%8A%A5%E5%B9%B3%E9%9D%A2ABCD%2CPA%3DAD%3D2%2CAB%3D1%2CBM%E2%8A%A5PD%E4%BA%8E%E7%82%B9M.%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81AM%E2%8A%A5PD%EF%BC%882%EF%BC%89%E6%B1%82%E7%9B%B4%E7%BA%BFCD%E4%B8%8E%E5%B9%B3%E9%9D%A2ACM%E6%89%80%E6%88%90%E7%9A%84%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6)
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