Engineering

IMCOSH Function in Excel

Returns the hyperbolic cosine of a complex number.

Syntax

  • =IMCOSH(inumber)

Arguments

  • inumber (required): A complex number in x+yi or x+yj format

Examples

  • =IMCOSH("1+2i") - Hyperbolic cosine of 1+2i - Result: -0.642+1.069i

IMCOSH in technical sheets

  • Document units in adjacent cells — many engineering functions require exact unit strings.
  • Use [CONVERT](/functions/convert/) for unit changes before specialized formulas.
  • Validate inputs with [ISNUMBER](/functions/isnumber/) and range checks.

Common errors

  • #VALUE! if not a valid complex number

Use cases

  • Complex number calculations
  • Engineering
  • Signal processing

Frequently asked questions

  • What is the IMCOSH function in Excel? IMCOSH returns the hyperbolic cosine of a complex number. The syntax is =IMCOSH(inumber). Typical use cases include complex number calculations, engineering, signal processing.
  • How do I use the IMCOSH function? To use IMCOSH, type =IMCOSH( in a cell and provide the required arguments. Excel will show you the syntax and parameter hints as you type. Make sure to close the parentheses and press Enter to execute the function.
  • Why is IMCOSH not working in my Excel? Common issues with IMCOSH include #VALUE! if not a valid complex number. Start by checking the syntax =IMCOSH(inumber), then verify each referenced cell or range.

Editorial review

  • Reviewed by Excel.Directory Editorial Team. Updated May 2026.