This **`COSH()` function** returns the hyperbolic cosine of a number. It accepts an angle `β` in radian measure, but it should be a number. 

Figure 1 shows the mathematical representation of the hyperbolic cosine method.

 Figure 2 represents the graphical behavior of `COSH()` function between -3 and +3 intervals.

# 
## Syntax
```SQL
COSH(β) -- β is an angle measured in radians.
```

> To convert degrees to radians, use this formula: 
>
>*Radian angle* = $\frac{x\pi}{180}$, where $\pi$ = 3.14 and $x$ is the degree angle.
## Parameter
This `COSH()` method requires a floating-point number as an argument.
> Usually, this double-precision floating-point number takes 64-bits of computer memory.

## Return value
The `COSH()` function returns the hyperbolic cosine of the value that is sent as an argument.

* Passing `NULL` as a parameter to `COSH()` function, the function returns `NULL`.
* Passing `0` as a parameter to `COSH()` function, the function returns  `1.0`. 



-- Example showing how to use COSH(β)

/*Positive number*/
SELECT COSH(4); -- return 27.308232836016

/*Negative number*/
select COSH(-1); -- return 1.543080634815

/*Fractional number*/
select COSH(0.8);  -- return 1.337434946305

What is COSH( ) in SQL?

Syntax

Parameter

Return value

Code