Definition:Hyperbolic Cosine

Definition

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

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

$\displaystyle \cosh z := \dfrac {e^{z} + e^{-z}} 2$

Also see

• Catenary
• Hyperbolic Sine

Sources

• Weisstein, Eric W. "Hyperbolic Cosine." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/HyperbolicCosine.html