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如图,在四边形ABCD中,点E、F分别是边AB、AD的中点.若EF=2,BC=5,CD=3,则sinC的值为( )
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教案备课库《2017——2018学年九年级数学学科导学案(11)第24章《解直角三角形》单元测试》真题及答案
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