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1 - 1 = y - x =====> y - x
x y xy xy =====> (-x + y)(x - y) = -x² + xy + xy - y² x - y xy xy
= - x² + 2xy - y² = -x² + y² + 2
xy
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x - y x-y xy (x-y) xy ( x-y)
= -1/xy