Definition:Hyperbolic Cosine

Definition
The hyperbolic cosine function is defined on the complex numbers as:


 * $\cosh: \C \to \C$:


 * $\forall z \in \C: \cosh z := \dfrac {e^z + e^{-z} } 2$

Real Hyperbolic Cosine
On the real numbers it is defined similarly.

Also see

 * Definition:Hyperbolic Sine
 * Definition:Hyperbolic Tangent
 * Definition:Hyperbolic Cotangent
 * Definition:Hyperbolic Secant
 * Definition:Hyperbolic Cosecant


 * Equation of Catenary