# Documentation/Calc Functions/COS

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## Function name:

COS

## Category:

Mathematical

## Summary:

Returns the cosine of the given angle (in radians).

## Syntax:

COS(**Number**)

## Returns:

Returns the (trigonometric) cosine of **Number**, the angle in radians. The resultant value is between -1 and 1, i.e. [-1,1].

## Arguments:

**Number** is the real number,or a reference to a cell containing that number, which is the angle in radians whose cosine value is to be calculated.

## Additional details:

To insert an angle in degrees, either multiply the angle by PI()/180 or use the RADIANS function to convert the angle to radians.

The GIF below illustrates the function COS.

## Examples:

Formula | Description | Returns |
---|---|---|

=COS(1) | cosine of 1 radian | 0.54030230586814 |

=COS(PI()*2) | cosine of 2*PI or 2π radians | 1 |

=COS(RADIANS(60)) | cosine of 60° by first converting angle in degrees to radians. | 0.5 |

## Related LibreOffice functions:

## ODF standard:

## Equivalent Excel functions:

COS