Returns the arc tangent.

Category: | Trigonometric |

ATAN (argument)

The ATAN function returns
the 2-quadrant arc tangent (inverse tangent) of the argument. The
value that is returned is the angle (in radians) whose tangent is x and whose value ranges from -
$\phantom{\rule{0.212em}{0ex}}\pi \phantom{\rule{0.212em}{0ex}}/2$ to
$\phantom{\rule{0.212em}{0ex}}\pi \phantom{\rule{0.212em}{0ex}}/2$. If the argument is missing, then ATAN returns a
missing value.

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