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If y=f(x) passing through (1,2) satisfie...

If y=f(x) passing through (1,2) satisfies are differential equation y(1+xy)dx-x dy=0, then

A

`f(x)=(2x)/(2-x^(2))`

B

`f(x)=(x+1)/(x^(2)+1)`

C

`f(x)=(x-1)/(4-x^(2))`

D

`f(x)=(4x)/(1-2x^(2))`

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A
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