5a^2b(x-y)^2-30ab^2(y-x)^2

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5a^2b(x-y)^2-30ab^2(y-x)^25a^2b(x-y)^2-30ab^2(y-x)^25a^2b(x-y)^2-30ab^2(y-x)^25a^2b(x-y)^2-30ab^2(y-

5a^2b(x-y)^2-30ab^2(y-x)^2
5a^2b(x-y)^2-30ab^2(y-x)^2

5a^2b(x-y)^2-30ab^2(y-x)^2
5a^2b(x-y)^2-30ab^2(y-x)^2
=5a^2b(x-y)^2-30ab^2(x-y)^2
=5ab(x-y)^2*(a-6b)