(-1\2x-1\3y)(1\2x-1\3y)
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![(-1\2x-1\3y)(1\2x-1\3y)](/uploads/image/z/2832316-52-6.jpg?t=%28-1%5C2x-1%5C3y%29%281%5C2x-1%5C3y%29)
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(-1\2x-1\3y)(1\2x-1\3y)
(-1\2x-1\3y)(1\2x-1\3y)
(-1\2x-1\3y)(1\2x-1\3y)
(-1\2x-1\3y)(1\2x-1\3y)
=1/9y²-1/4x²
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=-(1/2x+1/3y)(1/2x-1/3y)
=-(1/4x²-1/9y²)
=1/9y²-1/4x²
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