text: #ifndef STAN_MATH_REV_FUN_POLAR_HPP
  #define STAN_MATH_REV_FUN_POLAR_HPP
  
  #include <stan/math/prim/meta.hpp>
  #include <stan/math/prim/fun/polar.hpp>
  #include <stan/math/prim/fun/isinf.hpp>
  #include <stan/math/prim/fun/isfinite.hpp>
  #include <stan/math/prim/fun/is_inf.hpp>
  #include <stan/math/prim/fun/sin.hpp>
  #include <stan/math/rev/core.hpp>
  #include <stan/math/rev/fun/is_inf.hpp>
  #include <stan/math/rev/fun/sin.hpp>
  #include <complex>
  #include <type_traits>
  
  namespace stan {
  namespace math {
  
  /**
   * Returns complex number with specified magnitude and phase angle.
   *
   * @param[in] r magnitude
   * @param[in] theta phase angle
   * @return complex number with magnitude and phase angle
   */
  inline std::complex<var> polar(const var& r, const var& theta) {
    return internal::complex_polar(r, theta);
  }
  
  /**
   * Returns complex number with specified magnitude and phase angle.
   *
   * @tparam T arithmetic type of magnitude
   * @param[in] r magnitude
   * @param[in] theta phase angle
   * @return complex number with magnitude and phase angle
   */
  template <typename T>
  inline std::complex<var> polar(T r, const var& theta) {
    return internal::complex_polar(r, theta);
  }
  
  /**
   * Returns complex number with specified magnitude and phase angle.
   *
   * @tparam T arithmetic type of phase angle
   * @param[in] r magnitude
   * @param[in] theta phase angle
   * @return complex number with magnitude and phase angle
   */
  template <typename T>
  inline std::complex<var> polar(const var& r, T theta) {
    return internal::complex_polar(r, theta);
  }
  
  }  // namespace math
  }  // namespace stan
  
  #endif
  