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=(4x³ - x² + 8x - 1)(4x³ + 2x² - 10x + 5)
=16 + 8 - 40 + 20x³ - 4 - 2 + 20x³ - 5x² + 32 +16 x³ - 80x² + 40x - 4x³ - 2x² + 10x-5
=16 + 4 -10 + 52x³ -7x² + 50x -5
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