The basic hyperbolic functions, cosh, sinh and tanh are related to the equilateral hyperbola, x^{2}y^{2}=1.
If the area between a line through the origin, the xaxis, and the hyperbola x^{2}y^{2}=1 has area α/2, then:
The equation used to calculate the hyperbolic cosine is:
The Excel Cosh function calculates the hyperbolic cosine (cosh) of a supplied number.
The syntax of the function is:
Where the number argument is a real number that you want to calculate the hyperbolic cosine of.
The following spreadsheet shows the Excel Cosh Function, used to calculated the hyperbolic cosine of three different numbers:
Formulas:

Results:

For further details and examples of the Excel Cosh function, see the Microsoft Office website.
If you get an error from the Excel Cosh Function, this is likely to be the #VALUE! error:
#VALUE!    Occurs if the supplied number argument is not recognized as a numeric value. 