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-ArcSin[(4 - x)/6]

Integrate[1/Sqrt[20 + 8*x - x^2], x] ==
-ArcSin[(4 - x)/6] 

                   1
Integrate[-------------------, x] == 
                           2
          Sqrt[20 + 8 x - x ]

        4 - x
-ArcSin[-----]
          6
Time to compute: 0.01 second
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