# Manuals/calci/ACOS

ACOS(Number)

• is any value and it is varying from -1 to 1.
• ACOS() returns the arccosine of a number.

## Description

• This function is the inverse function of COS in trigonometry.
• The value of ACOS(Number) in radians in the range 0 to pi().
• Calci returns the value of arccosine (inverse cosine) in Radians.
• The number can be a single value or any number of values.

For example, ACOS(0.5,(-0.2),1) gives the arcCOS or inverseCOS values for each element.

• Consider     x = 0.8    then     =ACOS(0.8)    gives    0.64350110879
• Also it is called as Cyclometric function.
• ACOS is described as arcCOS of a given number and denoted by .
• In ACOS(x), x value should be between -1 & 1.
• To find the angle in degrees, multiply the result angle with 180/PI(), or use DEGREES function.

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

## Examples

ACOS(x)

• x   is the number
 ACOS(number) Angle(radians) ACOS(0) 1.57079632 ACOS(1) 0

Inverse Cosine