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双対曲線 c^★を 求め 其の二重接線達を求め        図示をも願います; https://context.reverso.net/%E7%BF%BB%E8%A8%B3/%E6%97%A5%E6%9C%AC%E8%AA%9E-%E8%8B%B1%E8%AA%9E/%E8%A8%80%E3%81%84%E9%9B%A3%E3%81%84 https://context.reverso.net/%E7%BF%BB%E8%A8%B3/%E6%97%A5%E6%9C%AC%E8%AA%9E-%E8%8B%B1%E8%AA%9E/%E4%BA%91%E3%81%84%E9%9B%A3%E3%81%84