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

## What is IMCOS function in Excel?

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

## Syntax of IMCOS function

IMCOS(inumber)

The IMCOS function syntax has the following arguments:

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

## IMCOS formula explanation

- Use COMPLEX to convert real and imaginary coefficients into a complex number.
- If inumber is a logical value, IMCOS returns the #VALUE! error value.
- The cosine of a complex number is:

## Example

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 |

=IMCOS(“1+i”) | Cosine of 1+i | 0.833730025131149-0.988897705762865i |