ATAN

**Syntax:** **ATAN( X)**

*X* = a numeric value expressed in radians.

**ATAN** returns the 2-quadrant arc tangent of angle *X*. The
result is the angle (in radians) whose tangent is *X* and
ranges from to . To convert radians to degrees,
use the **DEGREES** function.

**Examples:**

**ATAN**(.5) = 0.463647609

**ATAN**(J44) = -0.785398163, where J44 = -1

**DEGREES**(**ATAN**(U6)) = 87.70939, where U6 = 25

**Excel function:** ATAN

Grey Trout Software

02 March 2003