# sinh()

Returns the hyperbolic sine of a double value.

## Syntax

`Numeric sinh()`

## Usage

The hyperbolic sine of `x` is defined to be (e`x` -
e-`x`)/2 where e is Euler's number.

Special cases:

- If the value is NaN, then the result is NaN.
- If the value is infinite, then the result is an infinity with the same sign as the value.
- If the value is zero, then the result is a zero with the same sign as the value.

The computed result must be within 2.5 ulps of the exact result.