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int(pi/6)^(pi/3) tan^3xsin^2 3x(2sec^2x ...

`int_(pi/6)^(pi/3) tan^3xsin^2 3x(2sec^2x sin^2 3x+3tanx.sin6x)dx`

A

`(9)/(2)`

B

`-(1)/(18)`

C

`(7)/(18)`

D

`-(1)/(9)`

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