(-2ab^2)^2*(3a^2b-2ab-1)

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(-2ab^2)^2*(3a^2b-2ab-1)
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(-2ab^2)^2*(3a^2b-2ab-1)
(-2ab^2)^2*(3a^2b-2ab-1)

(-2ab^2)^2*(3a^2b-2ab-1)
(-2ab^2)^2*(3a^2b-2ab-1)
=4a^2b^4*(3a^2b-2ab-1)
=12a^4b^5-8a^3b^5-4a^2b^4