/// <summary>Trigonometric Hyperbolic Cotangent (coth, Cotangens hyperbolicus) of this <c>Complex</c>.</summary>
public Complex HyperbolicCotangent()
{
if (IsReal)
{
return(new Complex(Trig.HyperbolicCotangent(real), 0d));
}
double sini = Trig.Sine(imag);
double sinhr = Trig.HyperbolicSine(real);
double denom = sini * sini + sinhr * sinhr;
return(new Complex(sinhr * Trig.HyperbolicCosine(real) / denom, sini * Trig.Cosine(imag) / denom));
}
