##### Using the ATAN function:

The arguments for the ATAN function are:

Argument | Required? | Description |
---|---|---|

number | Required | The tangent of the angle you want. |

The 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.

ATAN takes 1 required argument and no optional arguments:

ATAN(number)

The arguments for the ATAN function are:

Argument | Required? | Description |
---|---|---|

number | Required | The tangent of the angle you want. |