---
tag: 036696EMG2
kind: concept
name: Hyperbolic cosine
msc: [33B10]
sources:
  - url: https://en.wikipedia.org/wiki/Hyperbolic_functions
    locator: Exponential definitions
---

## Summary

The hyperbolic cosine is the average of $e^x$ and $e^{-x}$. It is an even function with minimum value $1$ at $0$. The node [[hyperbolic cosine|0EQFWKJ37J]] gives the precise definition.