Changes

*This function is the inverse function of COS in trignometry.

*This function is the inverse function of COS in trignometry.

*Also it is called as Cyclometric function.  

*Also it is called as Cyclometric function.  

*ACOS is described as arcCOS and denoted by <math>cos^-1(n)</math>.

*ACOS is described as arcCOS and denoted by <math>cos^-1(x)</math>.

*In  ACOS(x), x value should be with in -1 & 1.

*In  ACOS(x), x value should be with in -1 & 1.

*To find the angle in degrees, multiply the result angle with 180/PI.

*To find the angle in degrees, multiply the result angle with 180/PI.

*DEGREES function can also be used.<br/>

*DEGREES function can also be used.<br/>

For example ACOS(-0.8)*180/PI() or DEGREES(ACOS(-0.8))'' gives 143.130102

For example ACOS(0.5)*180/PI() or DEGREES(ACOS(0.5))'' gives 60

== Examples ==

== Examples ==