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.
Syntax
ATAN(number)
Number is the tangent of the angle you want.
Remark
To express the arctangent in degrees, multiply the result by 180/PI() or use the DEGREES function.
Examples
Formula |
Description (Result) |
=ATAN(1) |
Arctangent of 1 in radians, pi/4 (0.785398) |
=ATAN(1)*180/PI() |
Arctangent of 1 in degrees (45) |
=DEGREES(ATAN(1)) |
Arctangent of 1 in degrees (45) |