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

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

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`int frac{x^4+1}{x^2+1}dx= int frac{x^4-1+1+1}{x^2+1}dx`
`=int (frac{x^4-1}{x^2+1}+frac{2}{x^2+1})dx`
`=int(x^2-1)dx+int frac{1}{x^2+1}dx`
`int x^2 dx- int dx+ int frac{1}{x^2+1}dx`
`=frac{x^3}{3}-x+tan^(-1)x+C`
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