怎么证明y=tanx(定义域是负二分之π到正二分之π的开区间)上存在四个点使得这四个点共圆? 知乎 Template




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tomski怎么证明y=tanx(定义域是负二分之π到正二分之π的开区间)上存在四个点使得这四个点共圆? 知乎 coloring