Grammar
ATAN(number)
Calculates the arctangent, or inverse tangent, of a number. The parameter number is the tangent of the returned angle, which is expressed in radians.
Parameter
number
The tangent of the angle you want.
The function supports only one number and returns illegal if more than one numbers are set.
The returned angle is between -pi/2 and pi/2 (exclusive). To express the returned angle in degrees, multiply the result by 180/PI().
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