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Verified answer
(3x²-2y²)(4x²-5y²)-y²(x²+2y²)12x⁴-15x²y²-8x²y²+10y⁴-x²y²-2y⁴
12x⁴-15x²y²-8x²y²-x²y²+10y⁴-2y⁴
12x⁴-24x²y²+8y⁴
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