已知一个等腰三角形的顶角为x度,腰长为l,怎么用与x相关的三角函数以及l来表示该等腰三角形的底边长? 知乎 Template




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tomski已知一个等腰三角形的顶角为x度,腰长为l,怎么用与x相关的三角函数以及l来表示该等腰三角形的底边长? 知乎 coloring