Name:	ACOS	Syntax:	(ACOS(arg))
Family:	Function	Category:	Trigonometric
Description:	Arccosine

ACOS computes the arccosine of arg where arg is in the range -1 to 1. The result is an angle in radians between 0 and p (where p = 3.14159265358979).

In the following example, the value of vacos is 2.094395, the arccosine of -0.5.

SET VAR vacos = (ACOS(-0.5))