a^2b^2c-abc+1/4c;a^2(x-y)+b^2(y-x);

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a^2b^2c-abc+1/4c;a^2(x-y)+b^2(y-x);

a^2b^2c-abc+1/4c;a^2(x-y)+b^2(y-x);
a^2b^2c-abc+1/4c;a^2(x-y)+b^2(y-x);

a^2b^2c-abc+1/4c;a^2(x-y)+b^2(y-x);
a^2b^2c-abc+1/4c
=c(a^2b^2-ab+1/4)
=c(ab-1/2)^2;
a^2(x-y)+b^2(y-x)
=a^2(x-y)-b^2(x-y)
=(x-y)(a^2-b^2)
=(x-y)(a+b)(a-b).