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Complex.Acos Method
Visual Studio 2010
Returns the angle that is the arc cosine of the specified complex number.
Assembly: System.Numerics (in System.Numerics.dll)
Parameters
- value
- Type: System.Numerics.Complex
A complex number that represents a cosine.
Return Value
Type: System.Numerics.ComplexThe angle, measured in radians, which is the arc cosine of value.
The Acos method for complex numbers corresponds to the Math.Acos method for real numbers.
The Acos method uses the following formula:
(-ImaginaryOne) * Log(value + ImaginaryOne * Sqrt(One - value * value)))
The following example illustrates the Acos method. 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)
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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