(x^2+2)(x^2-2)=x^{4}-4
(y-a^2)(y+a^2)=y^{2}-a^{4}
(a^2-4)(a^2+4)=a^{4}-16
(x^3+5)(x^3-5)=x^{6}-25
(ab-c)(ab+c)=a^{2}b^{2}-c^{2
(1-xy)(xy+1)=1-x^{2}y^{2
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(x^2+2)(x^2-2)=x^{4}-4
(y-a^2)(y+a^2)=y^{2}-a^{4}
(a^2-4)(a^2+4)=a^{4}-16
(x^3+5)(x^3-5)=x^{6}-25
(ab-c)(ab+c)=a^{2}b^{2}-c^{2
(1-xy)(xy+1)=1-x^{2}y^{2