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# Sin Function

计算一个角度的正弦值，角度以弧度为单位，结果在 -1 到 1 之间。

Using the angle Alpha, the Sin function returns the ratio of the length of the opposite side of an angle to the length of the hypotenuse in a right-angled triangle.

Sin(Alpha) = side opposite the angle/hypotenuse

### 语法:

    Sin (Number As Double) As Double

### 返回值:

双精度型

### 参数:

「数字」: 用于指定要计算正弦值的角度的数字表达式，以弧度为单位。

To convert degrees to radians, multiply degrees by Pi/180, and to convert radians to degrees, multiply radians by 180/Pi.

degrees=(radians*180)/Pi

radians=(degrees*Pi)/180

Pi is approximately 3.141593.

### 错误代码:

5 无效的过程调用

### 示例:

    ' 在此示例中，以下项均针对直角三角形:
    ' 角的对边和角度 (以度为单位)，并通过它们来计算斜边长度:
    Sub ExampleSine
    ' Pi = 3.1415926 是一个预定义的变量
    Dim d1 As Double
    Dim dAlpha As Double
        d1 = InputBox("输入对边长度: ","对边")
        dAlpha = InputBox("Enter the angle Alpha (in degrees):","Alpha")
        Print "The length of the hypotenuse is"; (d1 / sin (dAlpha * Pi / 180))
    End Sub

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Atn Function

Cos Function

Tan Function