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ArcSin[(2*x)/5]/2

Integrate[1/Sqrt[25 - 4*x^2], x] ==
ArcSin[(2*x)/5]/2 

                 1
Integrate[---------------, x] == 
                       2
          Sqrt[25 - 4 x ]

       2 x
ArcSin[---]
        5
-----------
     2
Time to compute: < 0.01 second
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