factorize.
challenge for toppers
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1 - 2x + y - x²y + x²
= x² + 1 - 2x + y - x²y
= ( x - 1 )² - y ( x² - 1 )
= ( x - 1 )² - y ( x + 1 ) ( x - 1 )
= (x - 1 ) ( ( x - 1 ) - y ( x + 1 )) Ans...... :))