Evaluate:`int1/(1+x+x^2+x^3)dx`

1.	Evaluate:`int1/(1+x+x^2+x^3)dx`
Answer» Correct Answer - `(1)/(2) log \| 1+x\|-(1)/(4) log \|1+x^(2)\|+(1)/(2)tan^(-1) x+c`

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