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a) (x-y) ( x+ y) – (x – y) ^2 + ( x+ y)^2 b) (x + 3) ( x^2 – 3x +1)^9 c) (x – 5) ( x^2 – 5x + 25) d) ( 2x – 1) ( 4x^2 + 2x + 1) – 4x (2x^2 -1)
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