subtract
x2+2xy-y2 from -2xy+2x2-3y2
solve this fassssssst
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= (x² + 2xy - y²) - ( -2xy + 2x² - 3y²)
= x² + 2xy - y² + 2xy - 2x² + 3y²
= x² - 2x² + 2xy + 2xy - y² + 3y²
= - x² + 4xy + 2y²
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