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-Sqrt[1 - 4*x^2]/2 + x*ArcCos[2*x]


Integrate[ArcCos[2*x], x] ==
-Sqrt[1 - 4*x^2]/2 + x*ArcCos[2*x]



Integrate[ArcCos[2 x], x] == 

             2
-Sqrt[1 - 4 x ]
--------------- + x ArcCos[2 x]
       2

Time to compute: 0.01 second

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