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If a curve y = f(x) passes through the p...

If a curve y = f(x) passes through the point (1, -1) and satisfies the differential equation,
`y(1+xy)dx=xdy," then "f(-(1)/(2))` is equal to

A

`-(2)/(5)`

B

`-(4)/(5)`

C

`(2)/(5)`

D

`(4)/(5)`

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