IMTAN function

This article describes the formula syntax and usage of the IMTAN function in Microsoft Excel.


Returns the tangent of a complex number in x+yi or x+yj text format.



The IMTAN function syntax has the following arguments.

  • Inumber    Required. A complex number for which you want the tangent.


  • 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.


Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.





Returns the tangent of a complex number, 4+3i.


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