ACOS (Transact-SQL)

Applies to: 👁 Image
SQL Server 👁 Image
Azure SQL Database 👁 Image
Azure SQL Managed Instance 👁 Image
Azure Synapse Analytics 👁 Image
Analytics Platform System (PDW) 👁 Image
SQL analytics endpoint in Microsoft Fabric 👁 Image
Warehouse in Microsoft Fabric 👁 Image
SQL database in Microsoft Fabric

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

👁 Image
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)); 

Here's the result set.

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

See also

Mathematical Functions (Transact-SQL)
Functions