ACOS Function
ACOS is a trigonometric function that returns the arc cosine of a number. The return value is in radians and is between PI/2 and -PI/2.
Syntax
ACOS(number)
Arguments
- number
-
The input parameter is a double precision number.
Return Type
The ACOS function returns a double precision number.
Examples
The following example returns the arc cosine of -1:
select acos(-1); acos ------------------ 3.14159265358979 (1 row)
The following example converts the arc cosine of .5 to the equivalent number of degrees:
select (acos(.5) * 180/(select pi())) as degrees; degrees --------- 60 (1 row)