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Intergrating factor of the differential ...

Intergrating factor of the differential equaiton `(x^(2)+1)(dy)/(dx)+2xy=x^(2)-1` is

A

`x^2 +1`

B

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

C

`(x^2-1)/(x^2+1)`

D

None of these

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The correct Answer is:
A
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