Complex.Cos(Complex) メソッド

定義

指定した複素数のコサインを返します。Returns the cosine of the specified complex number.

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

パラメーター

value
Complex

複素数。A complex number.

戻り値

Complex

value のコサイン。The cosine of value.

次の例は、メソッドを示してい Acos ます。The following example illustrates the Acos method. メソッドによって返された値を Acos メソッドに渡すと、 Cos 元の値が返されることがわかり Complex ます。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)

注釈

複素数のメソッドは、 Cos 実数のメソッドに対応して Math.Cos います。The Cos method for complex numbers corresponds to the Math.Cos method for real numbers.

メソッドは、 Cos 次の式を使用して、複素数 a + bi のコサインを計算します。The Cos method uses the following formula to calculate the cosine of the complex number a + bi:

( Cos (a) * Cosh (b)、-( Sin (a) * Sinh (b))(Cos(a) * Cosh(b), -(Sin(a) * Sinh(b)))

適用対象

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