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九年级数学：怎么求证EF是圆的切线？怎么求FC的长？三角函数综合
九年级数学：怎么求证EF是圆的切线？怎么求FC的长？三角函数综合
初中数学，圆的计算和证明，垂径定理，圆周角圆心角，切线，扇形160/233
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