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                # PHP atanh() 函數 ## 定義和用法 atanh() 函數返回一個角度的反雙曲正切。 ### 語法 ``` atanh(x) ``` | 參數 | 描述 | | --- | --- | | x | 必需。一個數。 | ### 說明 atanh() 函數返回 _x_ 的反雙曲正切值,即,其雙曲正切為 _x_ 的那個值。 ## 提示和注釋 注釋:本函數未在 Windows 平臺下實現。
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