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(2a+b)²;-(a-b)²;=[(2a+b)+(a-b)][(2a+b)-(a-b)]=3a(a+2b)(x²;+y²;)(x²;+y²;-4)+4=(x²;+y²;)²;-4(x²;+y²;)+4=(x²;+y²;-2)²;
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