Solve \(\rm \int {4x\over(2x^2+1)^2}\) dx

1
\(\rm -{1\over2x^2+1}+c\)
2
\(\rm {1\over2x^2+1}+c\)
3
\(\rm -{1\over(2x^2+1)^3}+c\)
4
\(\rm {3\over2x^2+1}+c\)

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