/// <summary>Trigonometric Tangent (tan, Tangens) of this <c>Complex</c>.</summary> public Complex Tangent() { if (IsReal) { return(new Complex(Trig.Tangent(real), 0d)); } double cosr = Trig.Cosine(real); double sinhi = Trig.HyperbolicSine(imag); double denom = cosr * cosr + sinhi * sinhi; return(new Complex(Trig.Sine(real) * cosr / denom, sinhi * Trig.HyperbolicCosine(imag) / denom)); }