x=根号(y²)-1
折线,相当于x=|y|-1
关于x轴上下对称,x轴上方为 x = y - 1 线,下方为 x = - y - 1 线
如果楼主是说 x=根号(y²-1)
就是其他答案中双曲线上下两支的有半侧部分
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