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## Definitions

### General

The hyperbolic cosine function is defined as:

The graph of the hyperbolic cosine function is shown in the figure below. It is a monotonic function, unlike the trigonometric cosine, which is periodic.

The points form the right wing of an equilateral hyperbola (see figure below), just like the trigonometric cosine, sine pairs form a circle.

The points form the right wing of an equilateral hyperbola (see figure below), just like the trigonometric cosine, sine pairs form a circle. Parameter t is the half area between the hyperbola, the x-axis and a ray from origin to the point.

### Series

All hyperbolic functions can be defined in an infinite series form. Hyperbolic cosine function can be written as:

### Properties

The derivative of the hyperbolic cosine function is the hyperbolic sine:

The integral of the hyperbolic cosine is given by: