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ArcSin[(4*x)/5]/4

Integrate[1/Sqrt[25 - 16*x^2], x] ==
ArcSin[(4*x)/5]/4 

                 1
Integrate[----------------, x] == 
                        2
          Sqrt[25 - 16 x ]

       4 x
ArcSin[---]
        5
-----------
     4
Time to compute: 0.01 second
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