Factorise :- (x-y)^2-7(x^2-y^2)+12(x+y)^2
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Step-by-step explanation:
(x-y)^2-7(x^2-y^2)+12(x+y)^2=0
(x^2-y^2)+12-7=0
(x^2-y^2)+5=0
2(x-y)^+5=0
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