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int(pi//6)^(pi//3) (sin^(3) x)/(sin^(3) ...

`int_(pi//6)^(pi//3) (sin^(3) x)/(sin^(3) x + cos^(3) x) dx= `

A

`(pi)/(6)`

B

`(pi)/(2)`

C

`(pi)/(3)`

D

`(pi)/(12)`

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