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The integrating factor of the first orde...

The integrating factor of the first order differential equation `x^(2)(x^(2)-1)(dy)/(dx)+x(x^(2)+1)y=x^(2)-1` is

A

`e^(x)`

B

`x-(1)/(x)`

C

`x+(1)/(x)`

D

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

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