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Solve the following differential equation: `(1+y^2)tan^(-1)dx+2y(1+x^2)dy=0`
A. `(1)/(2)(tan^(-1)x)^(2)+log(1+y^(2))=c`
B. `(tan^(-1)x)^(2)+logsqrt(1+y^(2))=c`
C. `(1+y^(2))tan^(-1)x=c`
D. `(tan^(-1)x)(tan^(-1)y)=c`

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