acos-transact-sql.md

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ACOS (Transact-SQL)	ACOS (Transact-SQL)	markingmyname	maghan	07/24/2017	sql	t-sql	reference	ACOS ACOS_TSQL	cosine ACOS function arccosine	TSQL	>= aps-pdw-2016 || = azuresqldb-current || = azure-sqldw-latest || >= sql-server-2016 || >= sql-server-linux-2017 || = azuresqldb-mi-current||=fabric

ACOS (Transact-SQL)

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A function that returns the angle, in radians, whose cosine is the specified float expression. This is also called arccosine.

:::image type="icon" source="../../includes/media/topic-link-icon.svg" border="false"::: Transact-SQL syntax conventions

Syntax

ACOS ( float_expression )  

Arguments

float_expression
An expression of either type float or of a type that can implicitly convert to float. Only a value ranging from -1.00 to 1.00 is valid. For values outside this range, no value is returned, and ACOS will report a domain error.

Return types

float

Examples

This example returns the ACOS value of the specified number.

SET NOCOUNT OFF;  
DECLARE @cos FLOAT;  
SET @cos = -1.0;  
SELECT 'The ACOS of the number is: ' + CONVERT(VARCHAR, ACOS(@cos));  

[!INCLUDEssResult]

---------------------------------   
The ACOS of the number is: 3.14159   
  
(1 row(s) affected)  

See also

Mathematical Functions (Transact-SQL)
Functions