/// <summary>
/// Trigonometric Hyperbolic Secant of a <c>Complex</c> number.
/// </summary>
/// <param name="value">
/// The complex value.
/// </param>
/// <returns>
/// The hyperbolic secant of a complex number.
/// </returns>
public static Complex HyperbolicSecant(this Complex value)
{
if (value.IsReal())
{
return(new Complex(HyperbolicSecant(value.Real), 0.0));
}
var exp = value.Exponential();
if (exp.IsInfinity())
{
return(Complex.Zero);
}
return(2 * exp / (exp.Square() + 1));
}
