/// <summary>Trigonometric Cosecant (Cosekans) of this <c>Complex</c>.</summary>
public Complex Csc()
{
if (IsReal)
{
return(new Complex(Trig.Csc(real), 0d));
}
double sinr = Trig.Sin(real);
double sinhi = Trig.Sinh(imag);
double denom = sinr * sinr + sinhi * sinhi;
return(new Complex(sinr * Trig.Cosh(imag) / denom, -Trig.Cos(real) * sinhi / denom));
}
