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Integrate : [3x^2]/[x^6+1]...

Integrate : `[3x^2]/[x^6+1]`

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` int (3x^(2))/(x^(6)+1)dx" "underset(rArr 3x^(2) dx=dt)(" Let "x^(3)=t)`
` = int (3x^(2))/((x^(3))^(2)+1)dx = int (1)/(t^(2)+1)dt`
` = tan^(-1) t+c= tan^(-1) (x^(3)) +c`
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