# SEC function

This article describes the formula syntax and usage of the SEC function (function: A prewritten formula that takes a value or values, performs an operation, and returns a value or values. Use functions to simplify and shorten formulas on a worksheet, especially those that perform lengthy or complex calculations.) in Microsoft Excel.

## Description

Returns the secant of an angle.

## Syntax

SEC(number)

The SEC function syntax has the following arguments.

**Number** Required. Number is the angle in radians for which you want the secant.

## Remarks

- The absolute value of number must be less than 2^27.
- If the angle is in degrees, either multiply the angle by PI()/180 or use the RADIANS function to covert the angle to radians.
- If number is outside of its constraints, SEC returns the #NUM! error value.
- If number is a non-numeric value, SEC returns the #VALUE! error values.

## Example

The workbook below shows examples of this function. Inspect them, change existing formulas, or enter your own formulas to learn how the function works.

To work more in-depth with the example data in Excel, download the embedded workbook to your computer, and then open it in Excel.