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Evaluate : int (x^(4))/(x^(2)+1) " dx "...

Evaluate : `int (x^(4))/(x^(2)+1) " dx "`

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`int (x^(4))/(x^(2)+1) dx= int ((x^(4) -1)+1)/(x^(2)+1) dx`
` =int (x^(2) -1 +(1)/(x^(2)+1)) " dx "`
` = int x^(2) " dx "- int 1 dx +int (1)/(x^(2) +1) " dx "`
` (x^(3))/(3)- x + " tan"^(-1) x+C`
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