Hyperbolic Cosine Calculator

#include <iostream>
#include <cmath>
#include <climits>
#define e 2.7182818284590452353602874713527

using namespace std;

double Cosh(double);

int main()
{
    double radians;
    cin >> radians;

    cout << fixed;
    cout << Cosh(radians) << endl;
}

double Sinh(double number)
{
    double cosh = 0;
    cosh = (pow(e,number)+(1/pow(e,number)))/2;

    return cosh;
}

/*
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Calculus II Math Exercise - Hyperbolic Cosine
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*/