<commit_before>#ifndef __STAN__AGRAD__REV__IBETA_HPP__
#define __STAN__AGRAD__REV__IBETA_HPP__

#include <stan/agrad/rev/var.hpp>

namespace stan {
  namespace agrad {
    
    namespace {
      /**
       * Calculates the generalized hypergeometric 3F2(a, a, b; a+1, a+1; z).
       *
       * Handles negative values of b properly.
       */<commit_msg>splitting ibeta out of agrad/special_functions.hpp<commit_after>#ifndef __STAN__AGRAD__REV__IBETA_HPP__
#define __STAN__AGRAD__REV__IBETA_HPP__

#include <stan/agrad/rev/var.hpp>
#include <stan/math/functions/ibeta.hpp>

namespace stan {
  namespace agrad {
    
    namespace {
      /**
       * Calculates the generalized hypergeometric 3F2(a, a, b; a+1, a+1; z).
       *
       * Handles negative values of b properly.
       */
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