(x+y)(x²+9y²)(x-y)=

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(x+y)(x²+9y²)(x-y)=

(x+y)(x²+9y²)(x-y)=
(x+y)(x²+9y²)(x-y)=

(x+y)(x²+9y²)(x-y)=
=(x²-y²)(x²+9y²)=x^4-9y^4+8X^2y^2