# IMTAN function: Description, Usage, Syntax, Examples and Explanation

## What is IMTAN function in Excel?

IMTAN function is one of Engineering functions in Microsoft Excel that returns the tangent of a complex number in x+yi or x+yj text format.

## Syntax of IMTAN function

IMTAN(inumber)

The IMTAN function syntax has the following arguments.

**Inumber:**A complex number for which you want the tangent.

## IMTAN formula explanation

- Use COMPLEX to convert real and imaginary coefficients into a complex number.
- If inumber is a value that is not in the x+yi or x+yj text format, IMTAN returns the #NUM! error value.
- If inumber is a logical value, IMTAN returns the #VALUE! error value.

## Example of IMTAN function

Steps to follow:

1. Open a new Excel worksheet.

2. Copy data in the following table below and paste it in cell A1

Note: For formulas to show results, select them, press F2 key on your keyboard and then press Enter.

You can adjust the column widths to see all the data, if need be.

Formula |
Description |
Result |

=IMTAN(“4+3i”) | Returns the tangent of a complex number, 4+3i. | 0.00490825806749606+1.00070953606723i |