The **`TANH()` method** in SQL returns the hyperbolic tangent of a parametric value. More precisely, it takes a double-precision number in arguments that specify the angle in radians. `TANH()` returns the _hyperbolic tangent_ of this specific angle. 



Figure 1 illustrates the mathematical representation of the hyperbolic tangent method. Figure 2 demonstrates the graphical behavior of `TANH()` between a `-5 to +5` interval.

#   
#  Syntax
```
TANH(θ) //θ should be Radian angle
```
> To convert degrees to radians, use this formula:
Radian angle = Degree angle * π/180
#   
## Parameter
The `TANH()` method requires a double-precision number as an argument. 
##  
## Return value
`TANH()` returns the hyperbolic tangent (double-precision number) of the value that is sent as a parameter.
* On passing `NULL` as a parameter, it will return `NULL`.
* On passing `0` as an argument, it will return `0`. 

#   
## Example
The following example illustrates how to use `TANH(x)` in SQL and shows its behavior in different scenarios.

-- Example showing how to use TANH(x)

/*Positive number*/
SELECT TANH(2); -- return 0.9640275800758169

/*Negative number*/
select TANH(-1); -- return -0.7615941559557649

/*Fractional number*/
select TANH(0.6);  -- return 0.5370495669980353


What is TANH() in SQL?

TANH() in SQL returns the hyperbolic tangent of a double-precision angle in radians.