ACOS (Transact-SQL)
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric
A function that returns the angle, in radians, whose cosine is the specified float expression. This is also called arccosine.
Transact-SQL syntax conventions
Syntax
ACOS ( float_expression )
Note
To view Transact-SQL syntax for SQL Server 2014 (12.x) and earlier versions, see Previous versions documentation.
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));
Here is the result set.
---------------------------------
The ACOS of the number is: 3.14159
(1 row(s) affected)
See also
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