cosh()

Returns the hyperbolic cosine of an argument given in radians.

std::cosh(n)

Use cosh() to return the hyperbolic cosine of 0.0 radians:

#include <iostream>
#include <cmath>

int main() {
  double x = 0.0;
  double result;

  result = std::cosh(x);

  std::cout << "The hyperbolic cosine of " << x << " radians is " << result << "\n";
  // Output: The hyperbolic cosine of 0 radians is 1
}