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x的平方等於y的影像你會畫不? 就是以x軸為對稱線的開口向上的曲線 在這個曲線極其開口以內的部分所構成的圖形,就是x的平方大於等於y的圖形
將y=x²;的影像向右旋轉90度
以原點為中心,以Z為半徑的圓,圓外面的區域和圓周一圈
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