int(3Tan""x/3 - Tan^(3)""x/3)/(1-3 Tan^2...

`int(3Tan""x/3 - Tan^(3)""x/3)/(1-3 Tan^2 ""x/3)dx = ?`

A

`-Log |Cos x| +c`

B

`Sec^2 x +c`

C

`Log |Tanx |+c`

D

`-Log |Sec x|+c`

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