# `Atan`

``Atan( value )``
``Atan( value )``
``Atan( value )``
``Atan( value )``
``atan( value )``
``Atan( value )``
``Atan( value )``

## Description

The `Atan` function is a trigonometric function which calculates ratios of the lengths of the sides of right triangles. `Atan` returns the arc tangent of a number.

## Parameters

Argument Type Definition and Requirements

`value`

The Number whose arc tangent should be returned.

## Returns

A Number which is the arc tangent of `value`.

## Examples

The following query returns the arc tangent of 0.5:

``````try
{
Value result = await client.Query(
Atan(0.5)
);

Console.WriteLine(result);
}
catch (Exception e)
{
Console.WriteLine(\$"ERROR: {e.Message}");
}``````
``DoubleV(0.4636476090008061)``
``````result, err := client.Query(
f.Atan(0.5))

if err != nil {
fmt.Fprintln(os.Stderr, err)
} else {
fmt.Println(result)
}``````
``0.4636476090008061``
``````System.out.println(
client.query(
Atan(Value(0.5))
).get());``````
``0.4636476090008061``
``````client.query(
q.Atan(0.5)
)
.then((ret) => console.log(ret))
.catch((err) => console.error('Error: %s', err))``````
``0.4636476090008061``
``````result = client.query(
q.atan(0.5)
)
print(result)``````
``0.4636476090008061``
``````try {
println(Await.result(
client.query(
Atan(0.5)
),
5.seconds
))} catch {
case unknown: Throwable => println("Error: " + unknown.getMessage())
}``````
``0.4636476090008061``
``Atan(0.5)``
``0.4636476090008061``