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Integrate[x^(2*m)/Sqrt[-a^2 + x^2], x] ==
(x^(1 + 2*m)*Sqrt[1 - x^2/a^2]*Hypergeometric2F1[1/2, 1/2 + m, 3/2 + m, x^2/a^2])/ ((1 + 2*m)*Sqrt[-a^2 + x^2])

                2 m
               x
Integrate[--------------, x] == 
                 2    2
          Sqrt[-a  + x ]

                    2
  1 + 2 m          x
(x        Sqrt[1 - --] 
                    2
                   a
 
                                        2
                      1  1      3      x
    Hypergeometric2F1[-, - + m, - + m, --]) / 
                      2  2      2       2
                                       a
 
                    2    2
  ((1 + 2 m) Sqrt[-a  + x ])