語言

Complex.Cos(Complex) 方法

定義

命名空間:
System.Numerics
組件:
System.Numerics.dll, System.Runtime.Numerics.dll
組件:
netstandard.dll, System.Runtime.Numerics.dll
組件:
System.Runtime.Numerics.dll
組件:
System.Numerics.dll
組件:
netstandard.dll
來源:
Complex.cs
來源:
Complex.cs
來源:
Complex.cs
來源:
Complex.cs
來源:
Complex.cs

返回指定複數的餘弦值。

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

的 value餘弦值。

範例

以下範例說明此 Acos 方法。 它顯示將方法回傳 Acos 的值傳給方法 Cos 時，會返回原始 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)

open System.Numerics

let values =
    [ Complex(0.5, 2.); Complex(0.5, -2.); Complex(-0.5, 2.); Complex(-0.3, -0.8) ]

for value in values do
    printfn $"Cos(ACos({value})) = {Complex.Acos value |> Complex.Cos}"
// 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複數的方法對應Math.Cos於實數的方法。

該 Cos 方法計算複數 a + bi 的餘弦為 x + yi，其中：

  • x 是$\因為\時而\Cosh B$
  • y 是$-（\sin a \times \sinh b）$

適用於

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