# Difference between revisions of "Documentation/How Tos/Calc: ATAN function"

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* [[Documentation/How_Tos/Calc: SIN function|SIN]] | * [[Documentation/How_Tos/Calc: SIN function|SIN]] | ||

* [[Documentation/How_Tos/Calc: TAN function|TAN]] | * [[Documentation/How_Tos/Calc: TAN function|TAN]] | ||

− | * [[Documentation/How_Tos/Calc: COT function|COT]] | + | * [[Documentation/How_Tos/Calc: COT function|COT]] |

* [[Documentation/How_Tos/Calc: ACOS function|ACOS]] | * [[Documentation/How_Tos/Calc: ACOS function|ACOS]] | ||

* [[Documentation/How_Tos/Calc: ASIN function|ASIN]] | * [[Documentation/How_Tos/Calc: ASIN function|ASIN]] | ||

* [[Documentation/How_Tos/Calc: ATAN2 function|ATAN2]] | * [[Documentation/How_Tos/Calc: ATAN2 function|ATAN2]] | ||

− | * [[Documentation/How_Tos/Calc: ACOT function|ACOT]] | + | * [[Documentation/How_Tos/Calc: ACOT function|ACOT]] |

− | * [[Documentation/How_Tos/Calc: DEGREES function|DEGREES]] | + | * [[Documentation/How_Tos/Calc: DEGREES function|DEGREES]] |

− | * [[Documentation/How_Tos/Calc: Mathematical functions|Mathematical functions]] | + | * [[Documentation/How_Tos/Calc: Mathematical functions|Mathematical functions]] |

* [[Documentation/How_Tos/Calc: Functions listed alphabetically|Functions listed alphabetically]] | * [[Documentation/How_Tos/Calc: Functions listed alphabetically|Functions listed alphabetically]] | ||

* [[Documentation/How_Tos/Calc: Functions listed by category|Functions listed by category]]}} | * [[Documentation/How_Tos/Calc: Functions listed by category|Functions listed by category]]}} |

## Revision as of 13:52, 26 February 2009

## ATAN

Returns the inverse tangent (the arctangent) of a number.

### Syntax:

**ATAN(number)**

- returns the inverse trigonometric tangent of
, in other words the angle (in radians) whose tangent is**number**. The angle returned is between**number**and**-PI/2**.**PI/2**

- To return the angle in degrees, use the
function.**DEGREES**

### Example:

**ATAN(1)**

- returns
(**0.785398163397448**radians).**PI/4**

**DEGREES(ATAN(1))**

- returns
. The tangent of**45**degrees is**45**.**1**