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(-Log[Cos[3*x]] + Log[Sin[3*x]])/3

Integrate[Csc[3*x]*Sec[3*x], x] ==
(-Log[Cos[3*x]] + Log[Sin[3*x]])/3 

Integrate[Csc[3 x] Sec[3 x], x] == 

-Log[Cos[3 x]] + Log[Sin[3 x]]
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              3
Time to compute: 0.01 second
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