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-ArcTan[3*Csc[4*x]^2]/12


Integrate[Sin[8*x]/(9 + Sin[4*x]^4), x] ==
-ArcTan[3*Csc[4*x]^2]/12



            Sin[8 x]
Integrate[-------------, x] == 
                      4
          9 + Sin[4 x]

                  2
-ArcTan[3 Csc[4 x] ]
--------------------
         12

Time to compute: 0.04 second

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