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如图1,AB为⊙O的直径,直线CD切⊙O于点E,BF⊥CD于点F,交⊙O于点M,连结BE·(1)求证:BE平分∠ABF;
As shown in Figure 1, AB is the diameter of ⊙O, the straight line CD cuts O at point E, BF ⊥ CD at point F, intersects O at point M, and connects BE·(1) to verify: BE divides ∠ ABF;