Published Mar 28, 2023
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The Math.Cosh() class method returns the hyperbolic cosine of a given angle.



The Math.Cosh() method takes only one parameter, angle, an angle in radians of type double. The method returns the hyperbolic cosine of the angle as a double value, except if the value of angle equals:

  • NaN (not a number), then it returns NaN.
  • NegativeInfinity, then it returns PositiveInfinity.
  • PositiveInfinity, then it also returns PositiveInfinity.

Note: Depending on the operating system or architecture, the exact result or the input range of the Math.Cosh() method may differ due to the differences in the C runtime environment.


The following example first converts 45 degrees to radians, then uses the Math.Cosh() method to return the hyperbolic cosine of that angle. Math.Round() rounds up the result to five decimals. Finally, the result is printed using Console.WriteLine():

using System;
public class Example {
public static void Main(string[] args) {
double degrees = 45;
double radians = degrees * Math.PI/180;
double hyperbolicCosine = Math.Round(Math.Cosh(radians), 5);
Console.WriteLine("The hyperbolic cosine of " + degrees + " degrees is: " + hyperbolicCosine);

The example will result in the following output:

The hyperbolic cosine of 45 degrees is: 1.32461

Codebyte Example

The following example is runnable and returns the hyperbolic cosine of the angle given in degrees:

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