Complex.Acos(Complex) 方法

定义

返回表示指定复数的反余弦值的角度。Returns the angle that is the arc cosine of the specified complex number.

public:
 static System::Numerics::Complex Acos(System::Numerics::Complex value);
public static System.Numerics.Complex Acos (System.Numerics.Complex value);
static member Acos : System.Numerics.Complex -> System.Numerics.Complex
Public Shared Function Acos (value As Complex) As Complex

参数

value
Complex

表示余弦的复数。A complex number that represents a cosine.

返回

以弧度为单位的角度,它表示 value 的反余弦。The angle, measured in radians, which is the arc cosine of value.

示例

下面的示例演示 Acos 方法。The following example illustrates the Acos method. 它显示将 Acos 方法返回的值传递到 Cos 方法返回原始 Complex 值。It shows that passing the value returned by the Acos method to the Cos method returns the original Complex value.

using System;
using System.Numerics;

public class Example
{
   public static void Main()
   {
      Complex[] values = { new Complex(.5, 2), 
                           new Complex(.5, -2),
                           new Complex(-.5, 2),
                           new Complex(-.3, -.8) };
      foreach (Complex value in values)
         Console.WriteLine("Cos(ACos({0})) = {1}", value, 
                           Complex.Cos(Complex.Acos(value)));
   }
}
// The example displays the following output:
//       Cos(ACos((0.5, 2))) = (0.5, 2)
//       Cos(ACos((0.5, -2))) = (0.5, -2)
//       Cos(ACos((-0.5, 2))) = (-0.5, 2)
//       Cos(ACos((-0.3, -0.8))) = (-0.3, -0.8)
Imports System.Numerics

Module Example
   Public Sub Main()
      Dim values() As Complex = { New Complex(.5, 2), 
                                  New Complex(.5, -2),
                                  New Complex(-.5, 2),
                                  New Complex(-.3, -.8) }
      For Each value As Complex In values
         Console.WriteLine("Cos(ACos({0})) = {1}", value, 
                           Complex.Cos(Complex.Acos(value)))
      Next
   End Sub
End Module
' The example displays the following output:
'       Cos(ACos((0.5, 2))) = (0.5, 2)
'       Cos(ACos((0.5, -2))) = (0.5, -2)
'       Cos(ACos((-0.5, 2))) = (-0.5, 2)
'       Cos(ACos((-0.3, -0.8))) = (-0.3, -0.8)

注解

复数的 Acos 方法对应于实数的 Math.Acos 方法。The Acos method for complex numbers corresponds to the Math.Acos method for real numbers.

Acos 方法使用以下公式:The Acos method uses the following formula:

(-ImaginaryOne) * Logvalue + ImaginaryOne*SqrtOne - value * value)))(-ImaginaryOne) * Log(value + ImaginaryOne*Sqrt(One - value * value)))

适用于

另请参阅