Complex.Cos(Complex) 方法

定義

命名空間:

System.Numerics

組件:

System.Runtime.Numerics.dll

來源:

Complex.cs

傳回指定複數的餘弦函數。

public:
 static System::Numerics::Complex Cos(System::Numerics::Complex value);

public static System.Numerics.Complex Cos (System.Numerics.Complex value);

static member Cos : System.Numerics.Complex -> System.Numerics.Complex

Public Shared Function Cos (value As Complex) As Complex

參數

value

Complex

複數。

傳回

Complex

value 的餘弦函數。

範例

下列範例說明 Acos 方法。 它會顯示將 方法傳 Acos 回的值傳遞至 Cos 方法會傳回原始 Complex 值。

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)

備註

Cos複數的方法會對應至Math.Cos實數的方法。

方法 Cos 會使用下列公式來計算 +bi 複數的餘弦值：

(Cos () * Cosh (b) (Sin () * Sinh (b) ) )

另請參閱

• Acos(Complex)
• Cos(Double)