integrals.wolfram.com   Use one of Mathematica's 2500+ functions FREE online

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

                  1
Integrate[-----------------, x] == 
           m        2    2
          x  Sqrt[-a  + x ]

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