1) a^2+4b^2-1
2) b^4+3b^3+9b^2+27b-3b^3-9b^2-27b-81=b^4-81
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1) a^2+4b^2-1
2) b^4+3b^3+9b^2+27b-3b^3-9b^2-27b-81=b^4-81