已知直三棱柱ABC-A1B1C1.中
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已知直三棱柱ABC-A1B1C1.中，侧面AA1B1B为正方形, AB= BC = 2, E, F分别为AC和CC1的中点，D为棱A1B1上的点，BF丄A1B1.
(1) 证明：BF⊥DE；
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