# IMARGUMENT

## Content

This function returns the argument theta, which is an angle expressed in radians.

## Syntax

`IMARGUMENT(complexnum)`

## Arguments

[Required] The *complexnum* argument is a complex number for which to return the argument theta.

## Remarks

An error is returned if the *complexnum* argument is not in the form "x+yi" or "x+yj".

## Examples

`IMARGUMENT("3+5j")`