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ArcSin[2*Tan[x]]/2

Integrate[Sec[x]^2/Sqrt[1 - 4*Tan[x]^2], x] ==
ArcSin[2*Tan[x]]/2 

                      2
                Sec[x]
Integrate[-------------------, x] == 
                           2
          Sqrt[1 - 4 Tan[x] ]

ArcSin[2 Tan[x]]
----------------
       2
Time to compute: 1.45 second
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