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Which of the following solution of the d...

Which of the following solution of the differential equation dx - dy + y dx + xdy = 0 is not admissible?

A

log|(x-1) (y+1)| = c

B

`(x-1)^2 {(y+1)^2 = c^2`

C

-`log |(x-1)(y+1)| = log c`

D

`log \(x+1)(y-1)| = log c`.

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