acosh.hpp

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#ifndef STAN_MATH_FWD_FUN_ACOSH_HPP
#define STAN_MATH_FWD_FUN_ACOSH_HPP
 
#include <stan/math/fwd/meta.hpp>
#include <stan/math/fwd/core.hpp>
#include <stan/math/prim/fun/acosh.hpp>
#include <stan/math/prim/fun/square.hpp>
#include <stan/math/prim/fun/sqrt.hpp>
#include <cmath>
#include <complex>
 
namespace stan {
namespace math {
 
template <typename T>
inline fvar<T> acosh(const fvar<T>& x) {
  using std::sqrt;
  return fvar<T>(acosh(x.val_), x.d_ / sqrt(square(x.val_) - 1));
}
 
template <typename T>
inline std::complex<fvar<T>> acosh(const std::complex<fvar<T>>& z) {
  return internal::complex_acosh(z);
}
 
}  // namespace math
}  // namespace stan
#endif