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                # PHP cosh() 函數 ## 定義和用法 cosh() 函數返回一個數的雙曲余弦。 ### 語法 ``` cosh(x) ``` | 參數 | 描述 | | --- | --- | | x | 必需。一個數。 | ### 說明 返回 _x_ 的雙曲余弦值,定義為 (exp(arg) + exp(-arg))/2。 ## 例子 在本例中,我們將返回不同數的雙曲余弦: ``` <?php echo(cosh(3); echo(cosh(-3); echo(cosh(0); echo(cosh(M_PI); echo(cosh(2*M_PI)); ?> ``` 輸出: ``` 10.0676619958 10.0676619958 1 11.5919532755 267.746761484 ```
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