(3 - 2b) ² - 2(4a^2-18b)^2+(3a+2b)^2
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=9+4b²-12b-2(16a⁴+324b²-144a²b)+9a²+4b²+12ab
=9+4b²-12b-32a⁴-648b²-288a²b+9a²+4b²+12ab
=-640b²+9a²-32a⁴-288a²b-12b+12ab
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