If x=1 and y=-2; by using the identity find the following : (i) `(4y^2-9x^2)(16y^4+36x^2y^2+81x^4)` (ii) `(x+2y)(x^2-2xy+4y^2)`

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If x=-2 and y=1, by using an identity find the value: (4y^(2)-9x^(2))(16y^(4)+36x^(2)y^(2)+81x^(4))

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