cosh.hpp

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#ifndef STAN_MATH_REV_FUN_COSH_HPP
#define STAN_MATH_REV_FUN_COSH_HPP
 
#include <stan/math/rev/meta.hpp>
#include <stan/math/rev/core.hpp>
#include <stan/math/rev/core/operator_multiplication.hpp>
#include <stan/math/rev/fun/exp.hpp>
#include <stan/math/rev/fun/sin.hpp>
#include <stan/math/rev/fun/sinh.hpp>
#include <stan/math/prim/fun/cosh.hpp>
#include <cmath>
#include <complex>
 
namespace stan {
namespace math {
 
inline var cosh(const var& a) {
  return make_callback_var(std::cosh(a.val()), [a](const auto& vi) mutable {
    a.adj() += vi.adj() * std::sinh(a.val());
  });
}
 
template <typename VarMat, require_var_matrix_t<VarMat>* = nullptr>
inline auto cosh(const VarMat& a) {
  return make_callback_var(
      a.val().array().cosh().matrix(), [a](const auto& vi) mutable {
        a.adj() += vi.adj().cwiseProduct(a.val().array().sinh().matrix());
      });
}
 
inline std::complex<var> cosh(const std::complex<var>& z) {
  return stan::math::internal::complex_cosh(z);
}
 
}  // namespace math
}  // namespace stan
#endif