Return the inverse tangent value. The inverse tangent value is the Angle, and the tangent value is equal to the value of the Number parameter.
The returned Angle value will be expressed in radians, ranging from -pi/2 to pi/2.
grammar
ATAN (number)
Number Specifies the tangent value of the Angle.
Instructions
To represent the arctangent value in DEGREES, multiply the result again by 180/PI() or by the degrees function.
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