#include <iostream>
#include <cmath>
using namespace std;
int main()
{
cout << "cosh(-1) = " << cosh(-1) << endl;
cout << "cosh(1) = " << cosh(1) << endl;
cout << "cosh(0) = " << cosh(0) << endl;
cout << "cosh(-0) = " << cosh(-0) << endl;
cout << "cosh(0.9) = " << cosh(0.9) << endl;
cout << "cosh(3.141593 / 3) = " << cosh(3.141593 / 3) << endl;
cout << "cosh(3.141593 / 2) = " << cosh(3.141593 / 2) << endl;
return 0;
}
/*
run:
cosh(-1) = 1.54308
cosh(1) = 1.54308
cosh(0) = 1
cosh(-0) = 1
cosh(0.9) = 1.43309
cosh(3.141593 / 3) = 1.60029
cosh(3.141593 / 2) = 2.50918
*/