(a-2)²+(a+2)(a-4)

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(a-2)²+(a+2)(a-4)(a-2)²+(a+2)(a-4)(a-2)²+(a+2)(a-4)

(a-2)²+(a+2)(a-4)
(a-2)²+(a+2)(a-4)

(a-2)²+(a+2)(a-4)