4-12(x-y)+9(x-y)²

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4-12(x-y)+9(x-y)²4-12(x-y)+9(x-y)²4-12(x-y)+9(x-y)² 

4-12(x-y)+9(x-y)²
4-12(x-y)+9(x-y)²

4-12(x-y)+9(x-y)²