ACOS (Transact-SQL)

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

Syntax

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.

float

The following example returns the ACOS of the specified angle.

SET NOCOUNT OFF;
DECLARE @angle float;
SET @angle = -1.0;
SELECT 'The ACOS of the angle is: ' + CONVERT(varchar, ACOS(@angle));

Here is the result set.

--------------------------------- 
The ACOS of the angle is: 3.14159                        

(1 row(s) affected)