Complex.Cos(Complex) 方法

定义

返回指定复数的余弦值。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

参数

value
Complex

一个复数。A complex number.

返回

value 的余弦值。The 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 Cos 方法对应于实数的 Math.Cos 方法。The Cos method for complex numbers corresponds to the Math.Cos method for real numbers.

Cos 方法使用以下公式来计算复数 a + bi 的余弦值: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)))

适用于

另请参阅