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(Cos[(3*a*x)/2] + 3*Sin[(a*x)/2])/(3*a*(Cos[(a*x)/2] - Sin[(a*x)/2])^3)

Integrate[(1 - Sin[a*x])^(-2), x] ==
(Cos[(3*a*x)/2] + 3*Sin[(a*x)/2])/ (3*a*(Cos[(a*x)/2] - Sin[(a*x)/2])^3) 

                        -2
Integrate[(1 - Sin[a x])  , x] == 

     3 a x          a x
 Cos[-----] + 3 Sin[---]
       2             2
--------------------------
         a x        a x  3
3 a (Cos[---] - Sin[---])
          2          2
Time to compute: 0.05 second
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