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If two pairs of straight lines with combined equations xy + 4x - 3y - 12 = 0 and xy - 3x + 4y - 12 = 0 form a square. Then, the combined equation of its diagonals is

A

`x^(2)-2xy+y^(2)+x-y=0`

B

`x^(2)+2xy+y^(2)+x+y=0`

C

`x^(2)-y^(2)+x-y=0`

D

`x^(2)-y^(2)+x+y=0`

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