TANH

Description

Returns the hyperbolic tangent of x.

Syntax

TANH(<x>)

Parameters

Parameter	Description
<x>	The value for which the hyperbolic tangent is to be calculated

Return Value

The hyperbolic tangent of parameter x.

Special Cases

• When x is NaN, returns NaN
• When x is positive infinity, returns 1
• When x is negative infinity, returns -1
• When x is NULL, returns NULL

Example

select tanh(0),tanh(1);

+-------------------------+-------------------------+
| tanh(cast(0 as DOUBLE)) | tanh(cast(1 as DOUBLE)) |
+-------------------------+-------------------------+
|                       0 |      0.7615941559557649 |
+-------------------------+-------------------------+

select tanh(cast('nan' as double));

+-----------------------------+
| tanh(cast('nan' AS DOUBLE)) |
+-----------------------------+
| NaN                         |
+-----------------------------+

select tanh(cast('inf' as double));

+-----------------------------+
| tanh(cast('inf' AS DOUBLE)) |
+-----------------------------+
| 1                           |
+-----------------------------+

select tanh(cast('-inf' as double));

+------------------------------+
| tanh(cast('-inf' AS DOUBLE)) |
+------------------------------+
| -1                           |
+------------------------------+