What is \(\rm\int{x\log(1\ +\ x^2)\over1\ +\ x^2}dx\)?

1
\(\rm log(1\ +\ x^2)\over4\) + C
2
\(\rm \left[log(1\ +\ x^2)\right]^2\over4\) + C
3
\(\rm x\over log(1\ +\ x^2)\) + C
4
None of these.

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