The ATAN function returns the arctangent, or inverse tangent, of a number. The arctangent is the angle whose tangent is number. The returned angle is given in radians in the range -pi/2 to pi/2.

ATAN takes 1 required argument and no optional arguments:

Syntax: ATAN(number)

#1)
Using the ATAN function:
#2)
The arguments for the ATAN function are:
Argument Required? Description
number Required The tangent of the angle you want.

Summary

The ATAN function returns the arctangent, or inverse tangent, of a number. The arctangent is the angle whose tangent is number. The returned angle is given in radians in the range -pi/2 to pi/2.
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