Definition:Hyperbolic Cotangent/Real

Also see

 * Equivalence of Definitions of Real Hyperbolic Cotangent


 * Definition:Real Hyperbolic Sine
 * Definition:Real Hyperbolic Cosine
 * Definition:Real Hyperbolic Tangent
 * Definition:Real Hyperbolic Secant
 * Definition:Real Hyperbolic Cosecant