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ACOS (Transact-SQL)

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

Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.

Topic link icon Transact-SQL Syntax Conventions

ACOS ( float_expression )

float_expression

Is an expression of the type float or of a type that can be implicitly converted to float, with a value from -1 through 1. Values outside this range return NULL and report a domain error.

The following example returns the ACOS 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)

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