The function **double cosh(double x);** returns the hyperbolic cosine of x radians.

## Function prototype of cosh

*double cosh(double x);***x**: A floating point value representing an angle in radians.

## Return value of cosh

It returns the hyperbolic cosine of x.

## C program using cosh function

The following program shows the use of cosh function to calculate hyperbolic cosine of a number.

#include <stdio.h> #include <math.h> int main(){ double value, radian; printf("Enter a number\n"); scanf("%lf", &radian); value = cosh(radian); printf("The hyperbolic cosine of %lf is %0.4lf\n", radian, value); return 0; }

Output

Enter a number 2.5 The hyperbolic cosine of 2.500000 is 6.1323

Enter a number 1.0 The hyperbolic cosine of 2.500000 is 1.5431