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Evaluate: int(x^2)/(sqrt(1-x^6 ))dx...

Evaluate: `int(x^2)/(sqrt(1-x^6 ))dx`

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`I=int (x^2)/sqrt(1-x^6)dx=int(x^2)/(sqrt9(1)^2-(x^3)^2)dx)`
let `x^3dx=dt`
`I=1/3 int dt/(sqrt(1-t^2))=1/3sin(-1)(t)+C=1/3 sin^(-1)(x^3)+C`
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