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Returns the arctangent value. The arctangent is the angle whose tangent is equal to the value of the Number parameter.
The angle value returned will be expressed in radians and range from -pi/2 to pi/2.
Syntax
ATAN（number）
Number The tangent of the angle.
Description
To express the arctangent in degrees, multiply the result by 180/PI( ) or expressed using the DEGREES function.
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