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交點的極限
Author:
羅驥韡 (Pegasus Roe)
藍色的圓：圓心 (1, 0)，半徑 1 紅色的圓：圓心 (0, 0)，半徑 OP 問題：當 P 趨近於原點時，R 趨近於哪裡？（請試著將 P 拉向原點）
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