#ifndef STAN_MATH_FWD_SCAL_FUN_INV_HPP
#define STAN_MATH_FWD_SCAL_FUN_INV_HPP

#include <stan/math/fwd/core.hpp>

#include <stan/math/prim/scal/fun/square.hpp>

namespace stan {
  namespace math {

    template <typename T>
    inline
    fvar<T>
    inv(const fvar<T>& x) {
      return fvar<T>(1 / x.val_, -x.d_ / square(x.val_));
    }
  }
}
#endif
