C库函数 cosh()

#include <stdio.h>

#include <math.h>



int main () {

   double x;

   x = 0.5;

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



   x = 1.0;

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



   x = 1.5;

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



   return(0);

}