ACOS(X)

 

Description

This function returns the arc cosine of angle X.  The result is the angle  (in radians) between 0 to PI whose cosine is X.  To convert the result from radians to degrees, use the DEGREES function.

 

Parameters

 

X

A numeric value between -1 and 1.

 

Examples

 

ACOS(1) = 0

 

ACOS(R3) = 1.670963748

Where R3 = -0.1.

 

DEGREES( ACOS(0) ) = 90

 

ACOS(-20) = #Error

Domain is -1 <= x <= 1.