5) E = x^6 + x^2 y^5 + xy^6 + x^2 y^5 - xy^6 6) F = x^3 y^4 - 5xy^8 + x^3 y^4 + xy^4 + 5y^8

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5) \( E = x^6 + x^2 y^5 + xy^6 + x^2 y^5 - xy^6 \)
6) \( F = x^3 y^4 - 5xy^8 + x^3 y^4 + xy^4 + 5y^8 \)