(а-1)^2-(а-2)(а+2)=(a^2-2a+1)-(a^2-4)=a^2-2a+1-a^2+4=5-2a
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(а-1)^2-(а-2)(а+2)=(a^2-2a+1)-(a^2-4)=a^2-2a+1-a^2+4=5-2a