# Complex.Acos(Complex) Metoda

## Definicja

Zwraca kąt, który jest cosinusem łuku określonego numeru zespolonego.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``

#### Parametry

value
Complex

Liczba zespolona reprezentująca cosinus.A complex number that represents a cosine.

#### Zwraca

Kąt mierzony w radianach, który jest cosinusem `value`łuku.The angle, measured in radians, which is the arc cosine of `value`.

## Przykłady

Poniższy przykład ilustruje Acos metodę.The following example illustrates the Acos method. Pokazuje, że przekazywanie wartości zwracanej przez Acos metodę Cos do metody zwraca oryginalną Complex wartość.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)
``````

## Uwagi

Metoda dla liczb zespolonych odpowiada Math.Acos metodzie liczb rzeczywistych. AcosThe Acos method for complex numbers corresponds to the Math.Acos method for real numbers.

Acos Metoda używa następującej formuły:The Acos method uses the following formula:

(-ImaginaryOne) * Log(`value` + ImaginaryOne*Sqrt(One - `value` * `value`)))(-ImaginaryOne) * Log(`value` + ImaginaryOne*Sqrt(One - `value` * `value`)))