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Factorise: x^(4) + y^(4) - 27x^(2)y^(2)...

Factorise: `x^(4) + y^(4) - 27x^(2)y^(2)`

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The correct Answer is:
`(x^(2)+ 5xy -y^(2))(x^(2)-5xy -y^(2))`
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