*Here <math>CSCH(z)= (sinh(z))^{-1}</math> ie, <math>\frac{2}{e^z-e^{-z}}</math> or <math>icsc(iz)</math>, where <math>i</math> is the imaginary unit and <math>i=\sqrt{-1}</math> | *Here <math>CSCH(z)= (sinh(z))^{-1}</math> ie, <math>\frac{2}{e^z-e^{-z}}</math> or <math>icsc(iz)</math>, where <math>i</math> is the imaginary unit and <math>i=\sqrt{-1}</math> |