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(x^(3))/(sqrt(1-x^(8)))...

`(x^(3))/(sqrt(1-x^(8)))`

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`"Let I "= int(x^(3))/(sqrt(1-x^(8)))dx`
`" Let "x^(4) =t rArr 4x^(3) dx=dt rArr x^(3) dx=(dt)/(4)` ltbegt`I=(1)/(4) int (1)/(sqrt(1-t^(2)))dt =(1)/(4) sin^(-1).t+C`
`=(1)/(4)sin^(-1) (x^(4)) +C`
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