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# What is cosh() in C?

harris910

The cosh() function returns the hyperbolic cosine of a number. To be more specific, it returns the hyperbolic cosine of a number in the radian float value.

Figure 1 shows the mathematical representation of the cosh() function.

Figure 1: Mathematical representation of hyperbolic cosine function

Note: The math.h header file is required for this function.

## Syntax

double cosh(double num)


## Parameter

This function requires a number that represents an angle in radians as a parameter.

In order to convert degrees to radians, use the following formula:

radians = degrees * ( PI / 180.0 )


## Return value

cosh() returns the hyperbolic cosine of a number (radians float value) that is sent as a parameter.

## Example

#include<stdio.h>
#include<math.h>

int main() {
printf("The hyperbolic cosine of %lf is %lf \n", 2.3, cosh(2.3));

printf("The hyperbolic cosine of %lf is %lf \n", -2.3, cosh(-2.3));

//converting the degrees angle into radians and then applying cosh()
// degrees = 90.0
// PI = 3.14159265
// result first converts degrees to radians then apply cosh
double result=cosh(90.0 * (3.14159265 / 180.0));
printf("The hyperbolic cosine of %lf is %lf \n", 90.0, result);

}

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