# Manuals/calci/ATAN

ATAN (Number)

• is any value.
• ATAN() returns the arctangent of a number.

## Description

• This function is the inverse function of TAN in trigonometry.
• The value of ATAN(x) is in radians in the range 0 to to .
• Calci returns the value of arctangent (inverse tan) in Radians.
• The number can be a single value or any number of values.

For example, ATAN(0.5,(-0.2),1) gives the arcTAN or inverseTAN values for each element.

• Consider     x = 0.8    then     =ATAN(0.8)    gives    0.67474094
• It is also known as Cyclometric function.
• ATAN is described as arctan of a given number and denoted by .
• In ATAN(x), x value applicable for all real numbers.
• To find the angle in degrees, multiply the result angle with 180/PI(), or use DEGREES function.

For example ATAN(-0.8)*180/PI() or DEGREES(ATAN(-0.8)) gives -38.659808

## Examples

ATAN(x)

• x   is the number.
 ATAN(number) Angle(radian) ATAN(0) 0 ATAN(1) 0.78539816 ATAN(90) 1.55968567

ArcTan