# atan

### Description

Returns the angle (in radians) whose tangent is specified.

### Syntax

atan(*tangent* )

### Parameters

*tangent*
is the tangent of the angle, expressed as a column
name, variable, or constant of type *float*, *real*, *double
precision*, or any datatype that can be implicitly converted
to one of these types.

### Examples

*Example 1*

select atan(0.50)

--------------------
0.463648

### Usage

**atan**, a mathematical
function, returns the angle (in radians) whose tangent is the specified
value.

For general information about mathematical functions,
see “Mathematical functions”.

### Standards

**SQL92** – Compliance level: Transact-SQL
extension.

### Permissions

Any user can execute **atan**.

### See also

**Functions** atn2, degrees, radians, tan