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प्रश्न
Factorise completely: x2 - y2 - 2x + 2y
बेरीज
उत्तर
x2 - y2 - 2x + 2y = (x2 - y2) - 2(x - y)
= (x + y) (x - y) - 2(x - y)
= (x - y)(x + y - 2)
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Factorising Completely
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