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I=int (dx)/(""^(4)sqrt( (x-1) ^(3) (x+2)...

`I=int (dx)/(""^(4)sqrt( (x-1) ^(3) (x+2)^(5)))=k ""^(4)sqrt((x-1)/(x+2))+C,` then 'k is equal to:

A

`(1)/(3)`

B

`(2)/(3)`

C

`(3)/(4)`

D

`(4)/(3)`

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