вычислить, используя формулу (a-b)(a+b)=a^2-b^2.... (x^2+2)(x^2-2)+... (y-a^2)(y+a^2)=... (a^2-4)(a^2+4)=.... (x^3+5)(x^3-5)=... (ab-c)(ab+c)=.... (1-xy)(xy+1)=....
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