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                            # PHP sinh() 函數



## 定義和用法

sinh() 函數返回一個數的雙曲正弦。

### 語法

```
sinh(x)
```

| 參數 | 描述 |
| --- | --- |
| x | 必需。一個數字。 |

### 說明

返回 _x_ 的雙曲正弦值，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正弦：

```
<?php
echo(sinh(3));
echo(sinh(-3));
echo(sinh(0));
echo(sinh(M_PI));
echo(sinh(M_PI_2));
?>
```

輸出：

```
10.0178749274
-10.0178749274
0
11.5487393573
2.30129890231
```




                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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