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反函數與原函數是關於y=x對稱的. 函數存在反函數的充要條件是,函數的定義域與值域是一一映射; 只要反函數有太多了. 例如常見的y=a^x與y=loga x 例如y=kx+b,那麼x=(y-b)/k 所以y=kx+b反函數是y=(x-b)/k
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