The hyperbolic cosecant is defined as csch z congruent 1/(sinh z) = 2/(e^z - e^(-z)). It is implemented in the Wolfram Language as Csch[z]. It is related to the hyperbolic cotangent though csch z = coth(1/2 z) - coth z.
We guarantee you’ll find the right tutor, or we’ll cover the first hour of your lesson.