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.



Number     is the tangent of the angle you want.


To express the arctangent in degrees, multiply the result by 180/PI() or use the DEGREES function.



Description (Result)


Arctangent of 1 in radians, pi/4 (0.785398)


Arctangent of 1 in degrees (45)


Arctangent of 1 in degrees (45)

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