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elasticsearch/docs/reference/query-languages/esql/_snippets/functions/acos.md
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[docs] Migrate docs from AsciiDoc to Markdown (#123507) 
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---------

Co-authored-by: Liam Thompson <32779855+leemthompo@users.noreply.github.com>
Co-authored-by: Liam Thompson <leemthompo@gmail.com>
Co-authored-by: Martijn Laarman <Mpdreamz@gmail.com>
Co-authored-by: István Zoltán Szabó <szabosteve@gmail.com>
2025-02-27 17:56:14 +01:00

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ACOS [esql-acos]

Syntax

:::{image} ../../../../../images/acos.svg :alt: Embedded :class: text-center :::

Parameters

number
Number between -1 and 1. If null, the function returns null.

Description

Returns the arccosine of n as an angle, expressed in radians.

Supported types

number result
double double
integer double
long double
unsigned_long double

Example

ROW a=.9
| EVAL acos=ACOS(a)
a:double acos:double
.9 0.45102681179626236