Solve the differential equation \(\rm xy+(x^2+1){dy\over dx} = 0\)

1
\(\rm \ln y= {\tan^{-1}{(x^2+1)}+c}\)
2
\(\rm y= {c\over\sqrt{x^2+ 1}}\)
3
\(\rm y= {1\over\sqrt{x^2+ 1}}+c\)
4
\(\rm \ln y= {\tan^{-1}{x}+c}\)

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