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Evaluate : int (x^(3))/(x^(4)+2)dx...

Evaluate : `int (x^(3))/(x^(4)+2)dx`

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`"Let I " =int (x^(3))/(x^(4)+2)" dx "`
`"Let " (x^(4)+2) =t`
`rArr " " 4x^(3)= (dt)/(dx)" "rArr " " x^(3) dx +(dt)/(4)`
`:. " " I= int (dt)/(4.t) = 1/4 log |t| +c`
`=1/4 " log " |x^(4) +2 |+c.`
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