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[" 12.If "(x+y)^(3)-(x-y)^(3)-6y(x^(2)-y...

[" 12.If "(x+y)^(3)-(x-y)^(3)-6y(x^(2)-y^(2))=ky^(2)," then "k=],[[" (a) "1," (b) "2," (c) "4," (d) "8]]

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